20+-2y=15+-1y

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Solution for 20+-2y=15+-1y equation: 



20+-2y=15+-1y

We move all terms to the left:

20+-2y-(15+-1y)=0

We add all the numbers together, and all the variables

-2y-(-1y)+20+=0

We add all the numbers together, and all the variables

-2y-(-1y)=0

We get rid of parentheses

-2y+1y=0

We add all the numbers together, and all the variables

-y=0

y=0/-1

y=0

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