(20*21+10c)-90=460

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Solution for (20*21+10c)-90=460 equation: 



(20*21+10c)-90=460

We move all terms to the left:

(20*21+10c)-90-(460)=0

We add all the numbers together, and all the variables

(10c+420)-90-460=0

We add all the numbers together, and all the variables

(10c+420)-550=0

We get rid of parentheses

10c+420-550=0

We add all the numbers together, and all the variables

10c-130=0

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

10c=130

c=130/10

c=13

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