(7x-12)=140

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Solution for (7x-12)=140 equation: 



(7x-12)=140

We move all terms to the left:

(7x-12)-(140)=0

We get rid of parentheses

7x-12-140=0

We add all the numbers together, and all the variables

7x-152=0

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

7x=152

x=152/7

x=21+5/7

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