K+1 is as simplified as it gets. Unless you find the value of K. You can't add a variable and number.
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3k-1=k+2 2k=3 k=3/2=1.5
k=4
It represents an algebraic equation in the variable, k.
3k-5=7k+73k-7k=7+5-4k=12k=-3
K/3 + k/4 = 1 LCD=12 *divide lcd by denominator* K(4) + K(3) = 12(1) 4k + 3k = 12 7k = 12 k=12/7