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x in (-oo:+oo)
(3/8)*x = 15/12 // - 15/12
(3/8)*x-(15/12) = 0
(3/8)*x-5/4 = 0
3/8*x-5/4 = 0 // + 5/4
3/8*x = 5/4 // : 3/8
x = 5/4/3/8
x = 10/3
x = 10/3
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