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 = 3.5/4.9 // - 3.5/4.9
k-(3.5/4.9) = 0
k-0.71428571 = 0
k-0.71428571 = 0 // + 0.71428571
k = 0.71428571
k = 0.71428571
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