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0.04(y-7)+0.21y=0.05y-0.20
We move all terms to the left:
0.04(y-7)+0.21y-(0.05y-0.20)=0
We add all the numbers together, and all the variables
0.04(y-7)+0.21y-(0.05y-0.2)=0
We add all the numbers together, and all the variables
0.21y+0.04(y-7)-(0.05y-0.2)=0
We multiply parentheses
0.21y+0.04y-(0.05y-0.2)-0.28=0
We get rid of parentheses
0.21y+0.04y-0.05y+0.2-0.28=0
We add all the numbers together, and all the variables
0.2y-0.08=0
We move all terms containing y to the left, all other terms to the right
0.2y=0.08
y=0.08/0.2
y=0.08/0.2
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