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(6x-20)+(x+12)=146
We move all terms to the left:
(6x-20)+(x+12)-(146)=0
We get rid of parentheses
6x+x-20+12-146=0
We add all the numbers together, and all the variables
7x-154=0
We move all terms containing x to the left, all other terms to the right
7x=154
x=154/7
x=22
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