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9y-30=4(y-5)
We move all terms to the left:
9y-30-(4(y-5))=0
We calculate terms in parentheses: -(4(y-5)), so:We get rid of parentheses
4(y-5)
We multiply parentheses
4y-20
Back to the equation:
-(4y-20)
9y-4y+20-30=0
We add all the numbers together, and all the variables
5y-10=0
We move all terms containing y to the left, all other terms to the right
5y=10
y=10/5
y=2
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