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0.3(4)+0.4y=0.8
We move all terms to the left:
0.3(4)+0.4y-(0.8)=0
We add all the numbers together, and all the variables
0.4y-0.46=0
We move all terms containing y to the left, all other terms to the right
0.4y=0.46
y=0.46/0.4
y=1+0.06/0.4
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