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0.8y+0.25=-0.4
We move all terms to the left:
0.8y+0.25-(-0.4)=0
We add all the numbers together, and all the variables
0.8y+0.65=0
We move all terms containing y to the left, all other terms to the right
0.8y=-0.65
y=-0.65/0.8
y=-0.65/0.8
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