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40=8(x+9)
We move all terms to the left:
40-(8(x+9))=0
We calculate terms in parentheses: -(8(x+9)), so:We get rid of parentheses
8(x+9)
We multiply parentheses
8x+72
Back to the equation:
-(8x+72)
-8x-72+40=0
We add all the numbers together, and all the variables
-8x-32=0
We move all terms containing x to the left, all other terms to the right
-8x=32
x=32/-8
x=-4
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