7x+5x=12

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Solution for 7x+5x=12 equation: 


Simplifying
7x + 5x = 12

Combine like terms: 7x + 5x = 12x
12x = 12

Solving
12x = 12

Solving for variable 'x'.

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

Divide each side by '12'.
x = 1

Simplifying
x = 1

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