9y-7y-13=21.64

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Solution for 9y-7y-13=21.64 equation: 



9y-7y-13=21.64

We move all terms to the left:

9y-7y-13-(21.64)=0

We add all the numbers together, and all the variables

2y-34.64=0

We move all terms containing y to the left, all other terms to the right

2y=34.64

y=34.64/2

y=17+0.64/2

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