7y+4+12y=21

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



7y+4+12y=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

19y-17=0

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

19y=17

y=17/19

y=17/19

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