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3.5y-3.5=4.2
We move all terms to the left:
3.5y-3.5-(4.2)=0
We add all the numbers together, and all the variables
3.5y-7.7=0
We move all terms containing y to the left, all other terms to the right
3.5y=7.7
y=7.7/3.5
y=2+0.7/3.5
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