C+(c+20)+(c+40)=90

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Solution for C+(c+20)+(c+40)=90 equation: 



+(C+20)+(C+40)=90

We move all terms to the left:

+(C+20)+(C+40)-(90)=0

We get rid of parentheses

C+C+20+40-90=0

We add all the numbers together, and all the variables

2C-30=0

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

2C=30

C=30/2

C=15

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