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(7x-6)+(9x+20)=142
We move all terms to the left:
(7x-6)+(9x+20)-(142)=0
We get rid of parentheses
7x+9x-6+20-142=0
We add all the numbers together, and all the variables
16x-128=0
We move all terms containing x to the left, all other terms to the right
16x=128
x=128/16
x=8
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