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x in (-oo:+oo)
6 = (3/8)*x // - (3/8)*x
6-((3/8)*x) = 0
(-3/8)*x+6 = 0
6-3/8*x = 0 // - 6
-3/8*x = -6 // : -3/8
x = -6/(-3/8)
x = 16
x = 16
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