Solve for k
k = \frac{40}{7} = 5\frac{5}{7} \approx 5.714285714
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10\times 28=49k
Variable k cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 10k, the least common multiple of k,10.
280=49k
Multiply 10 and 28 to get 280.
49k=280
Swap sides so that all variable terms are on the left hand side.
k=\frac{280}{49}
Divide both sides by 49.
k=\frac{40}{7}
Reduce the fraction \frac{280}{49} to lowest terms by extracting and canceling out 7.
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