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42x+42=31x-33
We move all terms to the left:
42x+42-(31x-33)=0
We get rid of parentheses
42x-31x+33+42=0
We add all the numbers together, and all the variables
11x+75=0
We move all terms containing x to the left, all other terms to the right
11x=-75
x=-75/11
x=-6+9/11
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