(3x-5)+(4x+8)=129

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Solution for (3x-5)+(4x+8)=129 equation:


Simplifying
(3x + -5) + (4x + 8) = 129

Reorder the terms:
(-5 + 3x) + (4x + 8) = 129

Remove parenthesis around (-5 + 3x)
-5 + 3x + (4x + 8) = 129

Reorder the terms:
-5 + 3x + (8 + 4x) = 129

Remove parenthesis around (8 + 4x)
-5 + 3x + 8 + 4x = 129

Reorder the terms:
-5 + 8 + 3x + 4x = 129

Combine like terms: -5 + 8 = 3
3 + 3x + 4x = 129

Combine like terms: 3x + 4x = 7x
3 + 7x = 129

Solving
3 + 7x = 129

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + 7x = 129 + -3

Combine like terms: 3 + -3 = 0
0 + 7x = 129 + -3
7x = 129 + -3

Combine like terms: 129 + -3 = 126
7x = 126

Divide each side by '7'.
x = 18

Simplifying
x = 18

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