(-3.4k-7)+(3k+21)=+0

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Solution for (-3.4k-7)+(3k+21)=+0 equation: 



(-3.4k-7)+(3k+21)=+0

We get rid of parentheses

-3.4k+3k-7+21=0

We add all the numbers together, and all the variables

-0.4k+14=0

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

-0.4k=-14

k=-14/-0.4

k=+35

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