-100=-4(1+3k)

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Solution for -100=-4(1+3k) equation: 



-100=-4(1+3k)

We move all terms to the left:

-100-(-4(1+3k))=0

We add all the numbers together, and all the variables

-(-4(3k+1))-100=0



We calculate terms in parentheses: -(-4(3k+1)), so:

-4(3k+1)

We multiply parentheses

-12k-4

Back to the equation:

-(-12k-4)



We get rid of parentheses

12k+4-100=0

We add all the numbers together, and all the variables

12k-96=0

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

12k=96

k=96/12

k=8

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