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40=(x-90)
We move all terms to the left:
40-((x-90))=0
We calculate terms in parentheses: -((x-90)), so:We get rid of parentheses
(x-90)
We get rid of parentheses
x-90
Back to the equation:
-(x-90)
-x+90+40=0
We add all the numbers together, and all the variables
-1x+130=0
We move all terms containing x to the left, all other terms to the right
-x=-130
x=-130/-1
x=+130
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