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x in (-oo:+oo)
(-3/8)*x = 11 // - 11
(-3/8)*x-11 = 0
-3/8*x-11 = 0 // + 11
-3/8*x = 11 // : -3/8
x = 11/(-3/8)
x = -88/3
x = -88/3
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