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x in (-oo:+oo)
(18/3)*x = 12/8 // - 12/8
(18/3)*x-(12/8) = 0
(18/3)*x-3/2 = 0
6*x-3/2 = 0 // + 3/2
6*x = 3/2 // : 6
x = 3/2/6
x = 1/4
x = 1/4
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