90=5(4+2k)

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Solution for 90=5(4+2k) equation: 



90=5(4+2k)

We move all terms to the left:

90-(5(4+2k))=0

We add all the numbers together, and all the variables

-(5(2k+4))+90=0



We calculate terms in parentheses: -(5(2k+4)), so:

5(2k+4)

We multiply parentheses

10k+20

Back to the equation:

-(10k+20)



We get rid of parentheses

-10k-20+90=0

We add all the numbers together, and all the variables

-10k+70=0

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

-10k=-70

k=-70/-10

k=+7

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