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x in (-oo:+oo)
(5/8)*x-(3/2) = 12 // - 12
(5/8)*x-(3/2)-12 = 0
(5/8)*x-3/2-12 = 0
5/8*x-27/2 = 0 // + 27/2
5/8*x = 27/2 // : 5/8
x = 27/2/5/8
x = 108/5
x = 108/5
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