40k+70=30k

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Solution for 40k+70=30k equation: 



40k+70=30k

We move all terms to the left:

40k+70-(30k)=0

We add all the numbers together, and all the variables

10k+70=0

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

10k=-70

k=-70/10

k=-7

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