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(0.50*9.0-y)+0.20y=3.0
We move all terms to the left:
(0.50*9.0-y)+0.20y-(3.0)=0
We add all the numbers together, and all the variables
(-1y+4.5)+0.20y-3=0
We add all the numbers together, and all the variables
0.20y+(-1y+4.5)-3=0
We get rid of parentheses
0.20y-1y+4.5-3=0
We add all the numbers together, and all the variables
-0.8y+1.5=0
We move all terms containing y to the left, all other terms to the right
-0.8y=-1.5
y=-1.5/-0.8
y=1+0.7/0.8
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