40k+90=90k+130

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Solution for 40k+90=90k+130 equation: 



40k+90=90k+130

We move all terms to the left:

40k+90-(90k+130)=0

We get rid of parentheses

40k-90k-130+90=0

We add all the numbers together, and all the variables

-50k-40=0

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

-50k=40

k=40/-50

k=-4/5

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