If it's not what You are looking for type in the equation solver your own equation and let us solve it.
k in (-oo:+oo)
k/2.1 = 3.3 // - 3.3
k/2.1-3.3 = 0
0.47619048*k-3.3 = 0 // + 3.3
0.47619048*k = 3.3 // : 0.47619048
k = 3.3/0.47619048
k = 6.92999994
k = 6.92999994
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