Solve the Equation: Simplifying -8(4-x) + 4(2x+5) = 2(7-2x)

Question

Solve for X:

8(4x)+4(2x+5)=2(72x) -8(4-x)+4(2x+5)=2(7-2x)

Video Solution

Solution Steps

00:00 Find X
00:05 Open parentheses properly, multiply by each factor
00:29 Collect like terms
00:46 Arrange the equation so that X is isolated on one side
01:07 Collect like terms
01:15 Isolate X
01:19 And this is the solution to the question

Step-by-Step Solution

To solve this linear equation, we will proceed step by step:

  • Step 1: Apply the distributive property to both sides of the given equation.
  • Step 2: Combine like terms on both sides.
  • Step 3: Rearrange the equation to isolate the variable xx.
  • Step 4: Solve for xx and verify against the choices provided.

Now, let's work through each step:

Step 1: Apply the distributive property:
8(4x)-8(4 - x) becomes 32+8x-32 + 8x and 4(2x+5)4(2x + 5) becomes 8x+208x + 20.
The right side 2(72x)2(7 - 2x) becomes 144x14 - 4x.

This gives us the new equation:
32+8x+8x+20=144x-32 + 8x + 8x + 20 = 14 - 4x.

Step 2: Combine like terms:
On the left side: 32+20+8x+8x=12+16x-32 + 20 + 8x + 8x = -12 + 16x.
On the right side: 144x14 - 4x remains unchanged.

The equation simplifies to:
12+16x=144x-12 + 16x = 14 - 4x.

Step 3: Rearrange the equation to isolate xx.
Add 4x4x to both sides to move the xx terms to one side:
12+16x+4x=14-12 + 16x + 4x = 14.
This simplifies to:
12+20x=14-12 + 20x = 14.

Next, add 12 to both sides to isolate terms with xx:
20x=14+1220x = 14 + 12.
Thus, 20x=2620x = 26.

Step 4: Solve for xx:
Divide by 20:
x=2620=1310x = \frac{26}{20} = \frac{13}{10}.

Therefore, the correct solution is x=1310 x = \frac{13}{10} , which corresponds to choice 3.

Answer

1310 \frac{13}{10}