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(X+20)=(4X-25)
We move all terms to the left:
(X+20)-((4X-25))=0
We get rid of parentheses
X-((4X-25))+20=0
We calculate terms in parentheses: -((4X-25)), so:We get rid of parentheses
(4X-25)
We get rid of parentheses
4X-25
Back to the equation:
-(4X-25)
X-4X+25+20=0
We add all the numbers together, and all the variables
-3X+45=0
We move all terms containing X to the left, all other terms to the right
-3X=-45
X=-45/-3
X=+15
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