x+x-78=180

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Solution for x+x-78=180 equation:


Simplifying
x + x + -78 = 180

Reorder the terms:
-78 + x + x = 180

Combine like terms: x + x = 2x
-78 + 2x = 180

Solving
-78 + 2x = 180

Solving for variable 'x'.

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

Add '78' to each side of the equation.
-78 + 78 + 2x = 180 + 78

Combine like terms: -78 + 78 = 0
0 + 2x = 180 + 78
2x = 180 + 78

Combine like terms: 180 + 78 = 258
2x = 258

Divide each side by '2'.
x = 129

Simplifying
x = 129

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