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0.05(20-y)+0.01y=0.64
We move all terms to the left:
0.05(20-y)+0.01y-(0.64)=0
We add all the numbers together, and all the variables
0.05(-1y+20)+0.01y-(0.64)=0
We add all the numbers together, and all the variables
0.01y+0.05(-1y+20)-0.64=0
We multiply parentheses
0.01y-0.05y+1-0.64=0
We add all the numbers together, and all the variables
-0.04y+0.36=0
We move all terms containing y to the left, all other terms to the right
-0.04y=-0.36
y=-0.36/-0.04
y=+9
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