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6x=2x-90
We move all terms to the left:
6x-(2x-90)=0
We get rid of parentheses
6x-2x+90=0
We add all the numbers together, and all the variables
4x+90=0
We move all terms containing x to the left, all other terms to the right
4x=-90
x=-90/4
x=-22+1/2
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