-21=-7(c+-10)

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Solution for -21=-7(c+-10) equation: 



-21=-7(c+-10)

We move all terms to the left:

-21-(-7(c+-10))=0

We add all the numbers together, and all the variables

-(-7(c-10))-21=0



We calculate terms in parentheses: -(-7(c-10)), so:

-7(c-10)

We multiply parentheses

-7c+70

Back to the equation:

-(-7c+70)



We get rid of parentheses

7c-70-21=0

We add all the numbers together, and all the variables

7c-91=0

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

7c=91

c=91/7

c=13

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