40=5-7k

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Solution for 40=5-7k equation: 



40=5-7k

We move all terms to the left:

40-(5-7k)=0

We add all the numbers together, and all the variables

-(-7k+5)+40=0

We get rid of parentheses

7k-5+40=0

We add all the numbers together, and all the variables

7k+35=0

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

7k=-35

k=-35/7

k=-5

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