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2y-30=-8y
We move all terms to the left:
2y-30-(-8y)=0
We get rid of parentheses
2y+8y-30=0
We add all the numbers together, and all the variables
10y-30=0
We move all terms containing y to the left, all other terms to the right
10y=30
y=30/10
y=3
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