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x in (-oo:+oo)
(-3/8)*x-4 = 20 // - 20
(-3/8)*x-20-4 = 0
-3/8*x-24 = 0 // + 24
-3/8*x = 24 // : -3/8
x = 24/(-3/8)
x = -64
x = -64
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