100=2(c-40)

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Solution for 100=2(c-40) equation: 



100=2(c-40)

We move all terms to the left:

100-(2(c-40))=0



We calculate terms in parentheses: -(2(c-40)), so:

2(c-40)

We multiply parentheses

2c-80

Back to the equation:

-(2c-80)



We get rid of parentheses

-2c+80+100=0

We add all the numbers together, and all the variables

-2c+180=0

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

-2c=-180

c=-180/-2

c=+90

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