6+7x+5x=66

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Solution for 6+7x+5x=66 equation: 


Simplifying
6 + 7x + 5x = 66

Combine like terms: 7x + 5x = 12x
6 + 12x = 66

Solving
6 + 12x = 66

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 12x = 66 + -6

Combine like terms: 6 + -6 = 0
0 + 12x = 66 + -6
12x = 66 + -6

Combine like terms: 66 + -6 = 60
12x = 60

Divide each side by '12'.
x = 5

Simplifying
x = 5

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