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-243=-9(+10+x)
We move all terms to the left:
-243-(-9(+10+x))=0
We add all the numbers together, and all the variables
-(-9(x+10))-243=0
We calculate terms in parentheses: -(-9(x+10)), so:We get rid of parentheses
-9(x+10)
We multiply parentheses
-9x-90
Back to the equation:
-(-9x-90)
9x+90-243=0
We add all the numbers together, and all the variables
9x-153=0
We move all terms containing x to the left, all other terms to the right
9x=153
x=153/9
x=17
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