20=5(-1+k)+5

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Solution for 20=5(-1+k)+5 equation: 



20=5(-1+k)+5

We move all terms to the left:

20-(5(-1+k)+5)=0

We add all the numbers together, and all the variables

-(5(k-1)+5)+20=0



We calculate terms in parentheses: -(5(k-1)+5), so:

5(k-1)+5

We multiply parentheses

5k-5+5

We add all the numbers together, and all the variables

5k

Back to the equation:

-(5k)



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

-5k=-20

k=-20/-5

k=+4

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