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7(x+3)=-(9+8x)
We move all terms to the left:
7(x+3)-(-(9+8x))=0
We add all the numbers together, and all the variables
7(x+3)-(-(8x+9))=0
We multiply parentheses
7x-(-(8x+9))+21=0
We calculate terms in parentheses: -(-(8x+9)), so:We get rid of parentheses
-(8x+9)
We get rid of parentheses
-8x-9
Back to the equation:
-(-8x-9)
7x+8x+9+21=0
We add all the numbers together, and all the variables
15x+30=0
We move all terms containing x to the left, all other terms to the right
15x=-30
x=-30/15
x=-2
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