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=2Y-7.+4Y=30
We move all terms to the left:
-(2Y-7.+4Y)=0
We add all the numbers together, and all the variables
-(6Y-7)=0
We get rid of parentheses
-6Y+7=0
We move all terms containing Y to the left, all other terms to the right
-6Y=-7
Y=-7/-6
Y=1+1/6
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