-13+(-4y)=-21

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Solution for -13+(-4y)=-21 equation: 



-13+(-4y)=-21

We move all terms to the left:

-13+(-4y)-(-21)=0

We add all the numbers together, and all the variables

(-4y)+8=0

We get rid of parentheses

-4y+8=0

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

-4y=-8

y=-8/-4

y=+2

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