21y-y=-40

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Solution for 21y-y=-40 equation: 



21y-y=-40

We move all terms to the left:

21y-y-(-40)=0

We add all the numbers together, and all the variables

20y+40=0

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

20y=-40

y=-40/20

y=-2

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