4(10k-10)=-4(5k+5)

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Solution for 4(10k-10)=-4(5k+5) equation: 



4(10k-10)=-4(5k+5)

We move all terms to the left:

4(10k-10)-(-4(5k+5))=0

We multiply parentheses

40k-(-4(5k+5))-40=0



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

-4(5k+5)

We multiply parentheses

-20k-20

Back to the equation:

-(-20k-20)



We get rid of parentheses

40k+20k+20-40=0

We add all the numbers together, and all the variables

60k-20=0

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

60k=20

k=20/60

k=1/3

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