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665=5(10x+3)
We move all terms to the left:
665-(5(10x+3))=0
We calculate terms in parentheses: -(5(10x+3)), so:We get rid of parentheses
5(10x+3)
We multiply parentheses
50x+15
Back to the equation:
-(50x+15)
-50x-15+665=0
We add all the numbers together, and all the variables
-50x+650=0
We move all terms containing x to the left, all other terms to the right
-50x=-650
x=-650/-50
x=+13
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