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42+9x=76-8x
We move all terms to the left:
42+9x-(76-8x)=0
We add all the numbers together, and all the variables
9x-(-8x+76)+42=0
We get rid of parentheses
9x+8x-76+42=0
We add all the numbers together, and all the variables
17x-34=0
We move all terms containing x to the left, all other terms to the right
17x=34
x=34/17
x=2
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