y-10+y+20=90

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Solution for y-10+y+20=90 equation: 



y-10+y+20=90

We move all terms to the left:

y-10+y+20-(90)=0

We add all the numbers together, and all the variables

2y-80=0

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

2y=80

y=80/2

y=40

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