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x in (-oo:+oo)
3*k+6*x = 12*b+1/4 // - 12*b+1/4
3*k-(12*b)+6*x-(1/4) = 0
3*k-12*b+6*x-1/4 = 0
3*k-12*b+6*x-1/4 = 0 // - 3*k-12*b-1/4
6*x = -(3*k-12*b-1/4) // : 6
x = (-(3*k-12*b-1/4))/6
x = (1/4-(-12*b)-(3*k))/6
x = (1/4-(-12*b)-(3*k))/6
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