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8x+72=2x-18
We move all terms to the left:
8x+72-(2x-18)=0
We get rid of parentheses
8x-2x+18+72=0
We add all the numbers together, and all the variables
6x+90=0
We move all terms containing x to the left, all other terms to the right
6x=-90
x=-90/6
x=-15
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