Solve for X in 7(x+5)-3(x-2)=5: Linear Equation Practice

Question

Solve for X:

7(x+5)3(x2)=5 7(x+5)-3(x-2)=5

Video Solution

Solution Steps

00:00 Find X
00:03 Carefully open parentheses properly, multiply by each factor
00:27 Solve each multiplication separately
00:35 Negative times negative always equals positive
00:43 Collect like terms
00:50 Arrange the equation so that X is isolated on one side
01:02 Collect like terms
01:08 Isolate X
01:14 Simplify as much as possible
01:18 This is the solution to the problem

Step-by-Step Solution

To solve the given equation 7(x+5)3(x2)=5 7(x + 5) - 3(x - 2) = 5 , we follow these steps:

  • Step 1: Apply the distributive property.
    Distribute 7 over (x+5) (x + 5) to obtain 7x+35 7x + 35 .
    Distribute -3 over (x2) (x - 2) to obtain 3x+6 -3x + 6 .
    The equation becomes 7x+353x+6=5 7x + 35 - 3x + 6 = 5 .
  • Step 2: Combine like terms.
    Combine the x x terms 7x 7x and 3x -3x to get 4x 4x .
    Combine the constant terms 35 35 and 6 6 to get 41 41 .
    The equation simplifies to 4x+41=5 4x + 41 = 5 .
  • Step 3: Isolate the variable x x .
    Subtract 41 from both sides: 4x+4141=541 4x + 41 - 41 = 5 - 41 .
    This simplifies to 4x=36 4x = -36 .
    Divide both sides by 4 to solve for x x : x=364 x = \frac{-36}{4} .
    The solution is x=9 x = -9 .

Therefore, the solution to the equation is x=9 x = -9 .

Answer

9 -9