Solve the Linear Equation: 7(x-4)+3=5-4(x+5) Step by Step

Question

Solve for X:

7(x4)+3=54(x+5) 7(x-4)+3=5-4(x+5)

Video Solution

Solution Steps

00:00 Find X
00:04 Make sure to open brackets properly, multiply by each factor
00:21 Solve each multiplication separately
00:27 Positive times negative always equals negative
00:42 Group terms
00:52 Arrange the equation so that one side has only the unknown X
01:12 Group terms
01:26 Isolate X
01:35 Simplify as much as possible
01:39 And this is the solution to the question

Step-by-Step Solution

Let's solve the given equation step by step:

We start with the equation:

7(x4)+3=54(x+5) 7(x-4) + 3 = 5 - 4(x+5)

Step 1: Apply the distributive property to eliminate the parentheses.

The left-hand side becomes:

7(x4)=7x28 7(x-4) = 7x - 28 , so the entire expression on the left is 7x28+3 7x - 28 + 3 .

The right-hand side becomes:

4(x+5)=4x20 -4(x+5) = -4x - 20 , so the whole right side is 54x20 5 - 4x - 20 .

Step 2: Simplify both sides.

Simplify the left-hand side:

7x28+3=7x25 7x - 28 + 3 = 7x - 25 .

Simplify the right-hand side:

54x20=4x15 5 - 4x - 20 = -4x - 15 .

Now the equation reads:

7x25=4x15 7x - 25 = -4x - 15 .

Step 3: Rearrange the equation to isolate x x terms on one side and constants on the other.

Add 4x 4x to both sides:

7x+4x25=4x+4x15 7x + 4x - 25 = -4x + 4x - 15 .

This simplifies to:

11x25=15 11x - 25 = -15 .

Step 4: Solve for x x .

Add 25 to both sides:

11x=10 11x = 10 .

Divide both sides by 11 to solve for x x :

x=1011 x = \frac{10}{11} .

Thus, the solution to the equation is x=1011 x = \frac{10}{11} .

Considering the given choices, the correct answer is choice 3: 1011 \frac{10}{11} .

Answer

1011 \frac{10}{11}