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x in (-oo:+oo)
(1/2)*k-3 = -9*x-4 // + -9*x-4
(1/2)*k-(-9*x)-3+4 = 0
(1/2)*k+9*x-3+4 = 0
1/2*k+9*x+1 = 0 // - 1/2*k+1
9*x = -(1/2*k+1) // : 9
x = (-(1/2*k+1))/9
x = (-(1/2*k+1))/9
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