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4(0.5)+0.4y=-1.2
We move all terms to the left:
4(0.5)+0.4y-(-1.2)=0
We add all the numbers together, and all the variables
0.4y+3.2=0
We move all terms containing y to the left, all other terms to the right
0.4y=-3.2
y=-3.2/0.4
y=-8
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