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650=y-0.6y
We move all terms to the left:
650-(y-0.6y)=0
We add all the numbers together, and all the variables
-(+0.4y)+650=0
We get rid of parentheses
-0.4y+650=0
We move all terms containing y to the left, all other terms to the right
-0.4y=-650
y=-650/-0.4
y=+1625
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