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-9x+15=-7(x+3)
We move all terms to the left:
-9x+15-(-7(x+3))=0
We calculate terms in parentheses: -(-7(x+3)), so:We get rid of parentheses
-7(x+3)
We multiply parentheses
-7x-21
Back to the equation:
-(-7x-21)
-9x+7x+21+15=0
We add all the numbers together, and all the variables
-2x+36=0
We move all terms containing x to the left, all other terms to the right
-2x=-36
x=-36/-2
x=+18
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