100-2y=90

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Solution for 100-2y=90 equation: 



100-2y=90

We move all terms to the left:

100-2y-(90)=0

We add all the numbers together, and all the variables

-2y+10=0

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

-2y=-10

y=-10/-2

y=+5

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