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42=5x+x+6
We move all terms to the left:
42-(5x+x+6)=0
We add all the numbers together, and all the variables
-(6x+6)+42=0
We get rid of parentheses
-6x-6+42=0
We add all the numbers together, and all the variables
-6x+36=0
We move all terms containing x to the left, all other terms to the right
-6x=-36
x=-36/-6
x=+6
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