20=10(9+c)

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Solution for 20=10(9+c) equation: 



20=10(9+c)

We move all terms to the left:

20-(10(9+c))=0

We add all the numbers together, and all the variables

-(10(c+9))+20=0



We calculate terms in parentheses: -(10(c+9)), so:

10(c+9)

We multiply parentheses

10c+90

Back to the equation:

-(10c+90)



We get rid of parentheses

-10c-90+20=0

We add all the numbers together, and all the variables

-10c-70=0

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

-10c=70

c=70/-10

c=-7

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