81=4+7y

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Solution for 81=4+7y equation: 



81=4+7y

We move all terms to the left:

81-(4+7y)=0

We add all the numbers together, and all the variables

-(7y+4)+81=0

We get rid of parentheses

-7y-4+81=0

We add all the numbers together, and all the variables

-7y+77=0

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

-7y=-77

y=-77/-7

y=+11

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