(13c+8c)*9=90

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Solution for (13c+8c)*9=90 equation: 



(13c+8c)*9=90

We move all terms to the left:

(13c+8c)*9-(90)=0

We add all the numbers together, and all the variables

(+21c)*9-90=0

We multiply parentheses

189c-90=0

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

189c=90

c=90/189

c=10/21

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