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8y-4y-9=66.36
We move all terms to the left:
8y-4y-9-(66.36)=0
We add all the numbers together, and all the variables
4y-75.36=0
We move all terms containing y to the left, all other terms to the right
4y=75.36
y=75.36/4
y=18+2.47058823529/2.94117647059
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