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0.05y+0.1(100-y)=7.5
We move all terms to the left:
0.05y+0.1(100-y)-(7.5)=0
We add all the numbers together, and all the variables
0.05y+0.1(-1y+100)-(7.5)=0
We add all the numbers together, and all the variables
0.05y+0.1(-1y+100)-7.5=0
We multiply parentheses
0.05y-0.1y+10-7.5=0
We add all the numbers together, and all the variables
-0.05y+2.5=0
We move all terms containing y to the left, all other terms to the right
-0.05y=-2.5
y=-2.5/-0.05
y=+50
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