12x+x=78

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Solution for 12x+x=78 equation: 


Simplifying
12x + x = 78

Combine like terms: 12x + x = 13x
13x = 78

Solving
13x = 78

Solving for variable 'x'.

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

Divide each side by '13'.
x = 6

Simplifying
x = 6

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