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0.8y=3.4=7.2
We move all terms to the left:
0.8y-(3.4)=0
We add all the numbers together, and all the variables
0.8y-3.4=0
We move all terms containing y to the left, all other terms to the right
0.8y=3.4
y=3.4/0.8
y=4+0.2/0.8
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