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42-4x=3-17x
We move all terms to the left:
42-4x-(3-17x)=0
We add all the numbers together, and all the variables
-4x-(-17x+3)+42=0
We get rid of parentheses
-4x+17x-3+42=0
We add all the numbers together, and all the variables
13x+39=0
We move all terms containing x to the left, all other terms to the right
13x=-39
x=-39/13
x=-3
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