If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x/2 = k // - k
x/2-k = 0
1/2*x-k = 0 // + k
1/2*x = k // : 1/2
x = k/1/2
x = 2*k
x = 2*k
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