3=1y+3*7

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Solution for 3=1y+3*7 equation: 



3=1y+3*7

We move all terms to the left:

3-(1y+3*7)=0

We add all the numbers together, and all the variables

-(y+21)+3=0

We get rid of parentheses

-y-21+3=0

We add all the numbers together, and all the variables

-1y-18=0

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

-y=18

y=18/-1

y=-18

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