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8(-1-x)=9(-x-2)
We move all terms to the left:
8(-1-x)-(9(-x-2))=0
We add all the numbers together, and all the variables
8(-1x-1)-(9(-1x-2))=0
We multiply parentheses
-8x-(9(-1x-2))-8=0
We calculate terms in parentheses: -(9(-1x-2)), so:We get rid of parentheses
9(-1x-2)
We multiply parentheses
-9x-18
Back to the equation:
-(-9x-18)
-8x+9x+18-8=0
We add all the numbers together, and all the variables
x+10=0
We move all terms containing x to the left, all other terms to the right
x=-10
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