(100-y)+9=81

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Solution for (100-y)+9=81 equation: 



(100-y)+9=81

We move all terms to the left:

(100-y)+9-(81)=0

We add all the numbers together, and all the variables

(-1y+100)+9-81=0

We add all the numbers together, and all the variables

(-1y+100)-72=0

We get rid of parentheses

-1y+100-72=0

We add all the numbers together, and all the variables

-1y+28=0

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

-y=-28

y=-28/-1

y=+28

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