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15=3(x-10)
We move all terms to the left:
15-(3(x-10))=0
We calculate terms in parentheses: -(3(x-10)), so:We get rid of parentheses
3(x-10)
We multiply parentheses
3x-30
Back to the equation:
-(3x-30)
-3x+30+15=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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