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9y-5y-13=66.40
We move all terms to the left:
9y-5y-13-(66.40)=0
We add all the numbers together, and all the variables
9y-5y-13-(66.4)=0
We add all the numbers together, and all the variables
4y-79.4=0
We move all terms containing y to the left, all other terms to the right
4y=79.4
y=79.4/4
y=19+2.4285714285714/2.8571428571428
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