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y+(y+1)=19
We move all terms to the left:
y+(y+1)-(19)=0
We get rid of parentheses
y+y+1-19=0
We add all the numbers together, and all the variables
2y-18=0
We move all terms containing y to the left, all other terms to the right
2y=18
y=18/2
y=9
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