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21x=(24x+15)
We move all terms to the left:
21x-((24x+15))=0
We calculate terms in parentheses: -((24x+15)), so:We get rid of parentheses
(24x+15)
We get rid of parentheses
24x+15
Back to the equation:
-(24x+15)
21x-24x-15=0
We add all the numbers together, and all the variables
-3x-15=0
We move all terms containing x to the left, all other terms to the right
-3x=15
x=15/-3
x=-5
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