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2x=8x+90
We move all terms to the left:
2x-(8x+90)=0
We get rid of parentheses
2x-8x-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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