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9y-7y-9=31.46
We move all terms to the left:
9y-7y-9-(31.46)=0
We add all the numbers together, and all the variables
2y-40.46=0
We move all terms containing y to the left, all other terms to the right
2y=40.46
y=40.46/2
y=20+0.46/2
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