-138+7x-x=72

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Solution for -138+7x-x=72 equation: 



-138+7x-x=72

We move all terms to the left:

-138+7x-x-(72)=0

We add all the numbers together, and all the variables

6x-210=0

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

6x=210

x=210/6

x=35

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