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10y-9=10-9y
We move all terms to the left:
10y-9-(10-9y)=0
We add all the numbers together, and all the variables
10y-(-9y+10)-9=0
We get rid of parentheses
10y+9y-10-9=0
We add all the numbers together, and all the variables
19y-19=0
We move all terms containing y to the left, all other terms to the right
19y=19
y=19/19
y=1
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