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(5x+15)=(4x-15)
We move all terms to the left:
(5x+15)-((4x-15))=0
We get rid of parentheses
5x-((4x-15))+15=0
We calculate terms in parentheses: -((4x-15)), so:We get rid of parentheses
(4x-15)
We get rid of parentheses
4x-15
Back to the equation:
-(4x-15)
5x-4x+15+15=0
We add all the numbers together, and all the variables
x+30=0
We move all terms containing x to the left, all other terms to the right
x=-30
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