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0.9y+3.9=5.78
We move all terms to the left:
0.9y+3.9-(5.78)=0
We add all the numbers together, and all the variables
0.9y-1.88=0
We move all terms containing y to the left, all other terms to the right
0.9y=1.88
y=1.88/0.9
y=2+0.08/0.9
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