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90=w/7
We move all terms to the left:
90-(w/7)=0
We add all the numbers together, and all the variables
-(+w/7)+90=0
We get rid of parentheses
-w/7+90=0
We multiply all the terms by the denominator
-w+90*7=0
We add all the numbers together, and all the variables
-1w+630=0
We move all terms containing w to the left, all other terms to the right
-w=-630
w=-630/-1
w=+630
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