3y+21-8y=-4

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Solution for 3y+21-8y=-4 equation: 



3y+21-8y=-4

We move all terms to the left:

3y+21-8y-(-4)=0

We add all the numbers together, and all the variables

-5y+25=0

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

-5y=-25

y=-25/-5

y=+5

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