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