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2.1+3.5y=0.5
We move all terms to the left:
2.1+3.5y-(0.5)=0
We add all the numbers together, and all the variables
3.5y+1.6=0
We move all terms containing y to the left, all other terms to the right
3.5y=-1.6
y=-1.6/3.5
y=-1/2.1875
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