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6y+9=2y-1
We move all terms to the left:
6y+9-(2y-1)=0
We get rid of parentheses
6y-2y+1+9=0
We add all the numbers together, and all the variables
4y+10=0
We move all terms containing y to the left, all other terms to the right
4y=-10
y=-10/4
y=-2+1/2
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