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x in (-oo:+oo)
4 = (-3/8)*x // - (-3/8)*x
4-((-3/8)*x) = 0
(3/8)*x+4 = 0
3/8*x+4 = 0 // - 4
3/8*x = -4 // : 3/8
x = -4/3/8
x = -32/3
x = -32/3
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