40k+90=30k=120

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Solution for 40k+90=30k=120 equation: 



40k+90=30k=120

We move all terms to the left:

40k+90-(30k)=0

We add all the numbers together, and all the variables

10k+90=0

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

10k=-90

k=-90/10

k=-9

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