90=120-3c

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Solution for 90=120-3c equation: 



90=120-3c

We move all terms to the left:

90-(120-3c)=0

We add all the numbers together, and all the variables

-(-3c+120)+90=0

We get rid of parentheses

3c-120+90=0

We add all the numbers together, and all the variables

3c-30=0

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

3c=30

c=30/3

c=10

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