Y+3x=x-7

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Solution for Y+3x=x-7 equation: 



+3Y=Y-7

We move all terms to the left:

+3Y-(Y-7)=0

We get rid of parentheses

3Y-Y+7=0

We add all the numbers together, and all the variables

2Y+7=0

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

2Y=-7

Y=-7/2

Y=-3+1/2

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