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8x-18=5x-42
We move all terms to the left:
8x-18-(5x-42)=0
We get rid of parentheses
8x-5x+42-18=0
We add all the numbers together, and all the variables
3x+24=0
We move all terms containing x to the left, all other terms to the right
3x=-24
x=-24/3
x=-8
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