7c+20=90

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Solution for 7c+20=90 equation: 



7c+20=90

We move all terms to the left:

7c+20-(90)=0

We add all the numbers together, and all the variables

7c-70=0

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

7c=70

c=70/7

c=10

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