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-504=-9(-10x-14)
We move all terms to the left:
-504-(-9(-10x-14))=0
We calculate terms in parentheses: -(-9(-10x-14)), so:We get rid of parentheses
-9(-10x-14)
We multiply parentheses
90x+126
Back to the equation:
-(90x+126)
-90x-126-504=0
We add all the numbers together, and all the variables
-90x-630=0
We move all terms containing x to the left, all other terms to the right
-90x=630
x=630/-90
x=-7
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