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730=10(9x+10)
We move all terms to the left:
730-(10(9x+10))=0
We calculate terms in parentheses: -(10(9x+10)), so:We get rid of parentheses
10(9x+10)
We multiply parentheses
90x+100
Back to the equation:
-(90x+100)
-90x-100+730=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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