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7y-5y-9=17.18
We move all terms to the left:
7y-5y-9-(17.18)=0
We add all the numbers together, and all the variables
2y-26.18=0
We move all terms containing y to the left, all other terms to the right
2y=26.18
y=26.18/2
y=13+0.18/2
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