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500-30y=130-20y
We move all terms to the left:
500-30y-(130-20y)=0
We add all the numbers together, and all the variables
-30y-(-20y+130)+500=0
We get rid of parentheses
-30y+20y-130+500=0
We add all the numbers together, and all the variables
-10y+370=0
We move all terms containing y to the left, all other terms to the right
-10y=-370
y=-370/-10
y=+37
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