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(9x+6)=42
We move all terms to the left:
(9x+6)-(42)=0
We get rid of parentheses
9x+6-42=0
We add all the numbers together, and all the variables
9x-36=0
We move all terms containing x to the left, all other terms to the right
9x=36
x=36/9
x=4
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