x+x=78+12

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Solution for x+x=78+12 equation: 


Simplifying
x + x = 78 + 12

Combine like terms: x + x = 2x
2x = 78 + 12

Combine like terms: 78 + 12 = 90
2x = 90

Solving
2x = 90

Solving for variable 'x'.

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

Divide each side by '2'.
x = 45

Simplifying
x = 45

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