-70=-7(c-90)

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Solution for -70=-7(c-90) equation: 



-70=-7(c-90)

We move all terms to the left:

-70-(-7(c-90))=0



We calculate terms in parentheses: -(-7(c-90)), so:

-7(c-90)

We multiply parentheses

-7c+630

Back to the equation:

-(-7c+630)



We get rid of parentheses

7c-630-70=0

We add all the numbers together, and all the variables

7c-700=0

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

7c=700

c=700/7

c=100

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