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.4Y-7Y=12
We move all terms to the left:
.4Y-7Y-(12)=0
We add all the numbers together, and all the variables
-6.6Y-12=0
We move all terms containing Y to the left, all other terms to the right
-6.6Y=12
Y=12/-6.6
Y=-1+3.8571428571429/4.7142857142857
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