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0.3y+0.5=0.8y-3.5
We move all terms to the left:
0.3y+0.5-(0.8y-3.5)=0
We get rid of parentheses
0.3y-0.8y+3.5+0.5=0
We add all the numbers together, and all the variables
-0.5y+4=0
We move all terms containing y to the left, all other terms to the right
-0.5y=-4
y=-4/-0.5
y=+8
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