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x in (-oo:+oo)
(3/2)*x = 14*(3/2) // - 14*(3/2)
(3/2)*x-(14*(3/2)) = 0
(3/2)*x-21 = 0
3/2*x-21 = 0 // + 21
3/2*x = 21 // : 3/2
x = 21/3/2
x = 14
x = 14
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