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650=100x-(40x)
We move all terms to the left:
650-(100x-(40x))=0
We add all the numbers together, and all the variables
-(+60x)+650=0
We get rid of parentheses
-60x+650=0
We move all terms containing x to the left, all other terms to the right
-60x=-650
x=-650/-60
x=10+5/6
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