4=10y-9y

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Solution for 4=10y-9y equation: 



4=10y-9y

We move all terms to the left:

4-(10y-9y)=0

We add all the numbers together, and all the variables

-(+y)+4=0

We get rid of parentheses

-y+4=0

We add all the numbers together, and all the variables

-1y+4=0

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

-y=-4

y=-4/-1

y=+4

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