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y+45=2(-2y+30)
We move all terms to the left:
y+45-(2(-2y+30))=0
We calculate terms in parentheses: -(2(-2y+30)), so:We get rid of parentheses
2(-2y+30)
We multiply parentheses
-4y+60
Back to the equation:
-(-4y+60)
y+4y-60+45=0
We add all the numbers together, and all the variables
5y-15=0
We move all terms containing y to the left, all other terms to the right
5y=15
y=15/5
y=3
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