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