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42=-8x+13x
We move all terms to the left:
42-(-8x+13x)=0
We add all the numbers together, and all the variables
-(+5x)+42=0
We get rid of parentheses
-5x+42=0
We move all terms containing x to the left, all other terms to the right
-5x=-42
x=-42/-5
x=8+2/5
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