x-15+x-21=108

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Solution for x-15+x-21=108 equation:


Simplifying
x + -15 + x + -21 = 108

Reorder the terms:
-15 + -21 + x + x = 108

Combine like terms: -15 + -21 = -36
-36 + x + x = 108

Combine like terms: x + x = 2x
-36 + 2x = 108

Solving
-36 + 2x = 108

Solving for variable 'x'.

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

Add '36' to each side of the equation.
-36 + 36 + 2x = 108 + 36

Combine like terms: -36 + 36 = 0
0 + 2x = 108 + 36
2x = 108 + 36

Combine like terms: 108 + 36 = 144
2x = 144

Divide each side by '2'.
x = 72

Simplifying
x = 72

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