5y-7=3y-21

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Solution for 5y-7=3y-21 equation: 



5y-7=3y-21

We move all terms to the left:

5y-7-(3y-21)=0

We get rid of parentheses

5y-3y+21-7=0

We add all the numbers together, and all the variables

2y+14=0

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

2y=-14

y=-14/2

y=-7

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