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1040=8(21+x)
We move all terms to the left:
1040-(8(21+x))=0
We add all the numbers together, and all the variables
-(8(x+21))+1040=0
We calculate terms in parentheses: -(8(x+21)), so:We get rid of parentheses
8(x+21)
We multiply parentheses
8x+168
Back to the equation:
-(8x+168)
-8x-168+1040=0
We add all the numbers together, and all the variables
-8x+872=0
We move all terms containing x to the left, all other terms to the right
-8x=-872
x=-872/-8
x=+109
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