40k+40=30k+70

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Solution for 40k+40=30k+70 equation: 



40k+40=30k+70

We move all terms to the left:

40k+40-(30k+70)=0

We get rid of parentheses

40k-30k-70+40=0

We add all the numbers together, and all the variables

10k-30=0

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

10k=30

k=30/10

k=3

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