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(9x+42)+(7x+30)=104
We move all terms to the left:
(9x+42)+(7x+30)-(104)=0
We get rid of parentheses
9x+7x+42+30-104=0
We add all the numbers together, and all the variables
16x-32=0
We move all terms containing x to the left, all other terms to the right
16x=32
x=32/16
x=2
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