21=104+-5y

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Solution for 21=104+-5y equation: 



21=104+-5y

We move all terms to the left:

21-(104+-5y)=0

We add all the numbers together, and all the variables

-(-5y)+21=0

We get rid of parentheses

5y+21=0

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

5y=-21

y=-21/5

y=-4+1/5

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