21-4y=13

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Solution for 21-4y=13 equation: 



21-4y=13

We move all terms to the left:

21-4y-(13)=0

We add all the numbers together, and all the variables

-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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