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10(9+y)=100
We move all terms to the left:
10(9+y)-(100)=0
We add all the numbers together, and all the variables
10(y+9)-100=0
We multiply parentheses
10y+90-100=0
We add all the numbers together, and all the variables
10y-10=0
We move all terms containing y to the left, all other terms to the right
10y=10
y=10/10
y=1
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