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40k+60=30k+80
We simplify the equation to the form, which is simple to understand
40k+60=30k+80
We move all terms containing k to the left and all other terms to the right.
+40k-30k=+80-60
We simplify left and right side of the equation.
+10k=+20
We divide both sides of the equation by 10 to get k.
k=2
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