That depends what the values of k and b are.
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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
5k
5k + 7 + 3k can be simplified into 8k + 7
9k + 8
It is 8k+7 simplified