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8x-90=2x-
We move all terms to the left:
8x-90-(2x-)=0
We add all the numbers together, and all the variables
8x-(+2x)-90=0
We get rid of parentheses
8x-2x-90=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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