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0.4y+0.9=2.5
We move all terms to the left:
0.4y+0.9-(2.5)=0
We add all the numbers together, and all the variables
0.4y-1.6=0
We move all terms containing y to the left, all other terms to the right
0.4y=1.6
y=1.6/0.4
y=4
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