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=3Y+4Y+7
We move all terms to the left:
-(3Y+4Y+7)=0
We add all the numbers together, and all the variables
-(7Y+7)=0
We get rid of parentheses
-7Y-7=0
We move all terms containing Y to the left, all other terms to the right
-7Y=7
Y=7/-7
Y=-1
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