7-y-y=4

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Solution for 7-y-y=4 equation: 



7-y-y=4

We move all terms to the left:

7-y-y-(4)=0

We add all the numbers together, and all the variables

-2y+3=0

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

-2y=-3

y=-3/-2

y=1+1/2

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