7(2y+4)=21

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Solution for 7(2y+4)=21 equation: 



7(2y+4)=21

We move all terms to the left:

7(2y+4)-(21)=0

We multiply parentheses

14y+28-21=0

We add all the numbers together, and all the variables

14y+7=0

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

14y=-7

y=-7/14

y=-1/2

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