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09y-0.7y=4.2
We move all terms to the left:
09y-0.7y-(4.2)=0
We add all the numbers together, and all the variables
8.3y-4.2=0
We move all terms containing y to the left, all other terms to the right
8.3y=4.2
y=4.2/8.3
y=1/1.9761904761905
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