90=3(k-40)

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Solution for 90=3(k-40) equation: 



90=3(k-40)

We move all terms to the left:

90-(3(k-40))=0



We calculate terms in parentheses: -(3(k-40)), so:

3(k-40)

We multiply parentheses

3k-120

Back to the equation:

-(3k-120)



We get rid of parentheses

-3k+120+90=0

We add all the numbers together, and all the variables

-3k+210=0

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

-3k=-210

k=-210/-3

k=+70

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