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10(40+-0.5y)+5y=400
We move all terms to the left:
10(40+-0.5y)+5y-(400)=0
We add all the numbers together, and all the variables
10(-0.5y)+5y-400=0
We add all the numbers together, and all the variables
5y+10(-0.5y)-400=0
We multiply parentheses
5y+0y-400=0
We add all the numbers together, and all the variables
6y-400=0
We move all terms containing y to the left, all other terms to the right
6y=400
y=400/6
y=66+2/3
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