77=13+y+7-9

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Solution for 77=13+y+7-9 equation: 



77=13+y+7-9

We move all terms to the left:

77-(13+y+7-9)=0

We add all the numbers together, and all the variables

-(y+11)+77=0

We get rid of parentheses

-y-11+77=0

We add all the numbers together, and all the variables

-1y+66=0

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

-y=-66

y=-66/-1

y=+66

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