20=10-10y

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Solution for 20=10-10y equation: 



20=10-10y

We move all terms to the left:

20-(10-10y)=0

We add all the numbers together, and all the variables

-(-10y+10)+20=0

We get rid of parentheses

10y-10+20=0

We add all the numbers together, and all the variables

10y+10=0

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

10y=-10

y=-10/10

y=-1

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