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x in (-oo:+oo)
(3/8)*x = 9/2 // - 9/2
(3/8)*x-(9/2) = 0
(3/8)*x-9/2 = 0
3/8*x-9/2 = 0 // + 9/2
3/8*x = 9/2 // : 3/8
x = 9/2/3/8
x = 12
x = 12
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