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X=(2X+90)
We move all terms to the left:
X-((2X+90))=0
We calculate terms in parentheses: -((2X+90)), so:We get rid of parentheses
(2X+90)
We get rid of parentheses
2X+90
Back to the equation:
-(2X+90)
X-2X-90=0
We add all the numbers together, and all the variables
-1X-90=0
We move all terms containing X to the left, all other terms to the right
-X=90
X=90/-1
X=-90
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