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13y-9y-15=30.68
We move all terms to the left:
13y-9y-15-(30.68)=0
We add all the numbers together, and all the variables
4y-45.68=0
We move all terms containing y to the left, all other terms to the right
4y=45.68
y=45.68/4
y=11+1/2.3809523809524
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