20-y=y-4

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Solution for 20-y=y-4 equation: 



20-y=y-4

We move all terms to the left:

20-y-(y-4)=0

We add all the numbers together, and all the variables

-1y-(y-4)+20=0

We get rid of parentheses

-1y-y+4+20=0

We add all the numbers together, and all the variables

-2y+24=0

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

-2y=-24

y=-24/-2

y=+12

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