3(2k+1)-8k=-21

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Solution for 3(2k+1)-8k=-21 equation: 



3(2k+1)-8k=-21

We move all terms to the left:

3(2k+1)-8k-(-21)=0

We add all the numbers together, and all the variables

-8k+3(2k+1)+21=0

We multiply parentheses

-8k+6k+3+21=0

We add all the numbers together, and all the variables

-2k+24=0

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

-2k=-24

k=-24/-2

k=+12

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