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x in (-oo:+oo)
4/c+3*x = 4 // - 4
4/c+3*x-4 = 0
4*c^-1+3*x-4 = 0 // - 4*c^-1-4
3*x = -(4*c^-1-4) // : 3
x = (-(4*c^-1-4))/3
x = (4-(4*c^-1))/3
x = (4-(4*c^-1))/3
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