18c-15c+(-7c)=-20

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Solution for 18c-15c+(-7c)=-20 equation: 



18c-15c+(-7c)=-20

We move all terms to the left:

18c-15c+(-7c)-(-20)=0

We add all the numbers together, and all the variables

3c+(-7c)+20=0

We get rid of parentheses

3c-7c+20=0

We add all the numbers together, and all the variables

-4c+20=0

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

-4c=-20

c=-20/-4

c=+5

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