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k(k + 5)
2k = 5k-30 Subtract 5k from both sides: -3k = -30 Divide both sides by -3 to find the value of k remembering that a minus divided into a minus becomes a plus: k = 10
That depends what the values of k and b are.
5000
3k+16 = 5k subtract 3k from both sides 16 = 2k divide both sides by 2 8 = k