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-1.2y-4.2y=3.78
We move all terms to the left:
-1.2y-4.2y-(3.78)=0
We add all the numbers together, and all the variables
-5.4y-3.78=0
We move all terms containing y to the left, all other terms to the right
-5.4y=3.78
y=3.78/-5.4
y=-2.12359550562/3.03370786517
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