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x in (-oo:+oo)
(15/8)*x-(3/4) = 12/3 // - 12/3
(15/8)*x-(3/4)-(12/3) = 0
(15/8)*x-3/4-4 = 0
15/8*x-19/4 = 0 // + 19/4
15/8*x = 19/4 // : 15/8
x = 19/4/15/8
x = 38/15
x = 38/15
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