-66+7x+2x=123

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Solution for -66+7x+2x=123 equation: 



-66+7x+2x=123

We move all terms to the left:

-66+7x+2x-(123)=0

We add all the numbers together, and all the variables

9x-189=0

We move all terms containing x to the left, all other terms to the right

9x=189

x=189/9

x=21

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