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-4+12x+42=17x+8
We move all terms to the left:
-4+12x+42-(17x+8)=0
We add all the numbers together, and all the variables
12x-(17x+8)+38=0
We get rid of parentheses
12x-17x-8+38=0
We add all the numbers together, and all the variables
-5x+30=0
We move all terms containing x to the left, all other terms to the right
-5x=-30
x=-30/-5
x=+6
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