7y+4+21=12

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Solution for 7y+4+21=12 equation: 



7y+4+21=12

We move all terms to the left:

7y+4+21-(12)=0

We add all the numbers together, and all the variables

7y+13=0

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

7y=-13

y=-13/7

y=-1+6/7

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