10y-30+20y-100=40y-900

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Solution for 10y-30+20y-100=40y-900 equation: 



10y-30+20y-100=40y-900

We move all terms to the left:

10y-30+20y-100-(40y-900)=0

We add all the numbers together, and all the variables

30y-(40y-900)-130=0

We get rid of parentheses

30y-40y+900-130=0

We add all the numbers together, and all the variables

-10y+770=0

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

-10y=-770

y=-770/-10

y=+77

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