72=18y-9y

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Solution for 72=18y-9y equation: 



72=18y-9y

We move all terms to the left:

72-(18y-9y)=0

We add all the numbers together, and all the variables

-(+9y)+72=0

We get rid of parentheses

-9y+72=0

We move all terms containing y to the left, all other terms to the right

-9y=-72

y=-72/-9

y=+8

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