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x in (-oo:+oo)
48 = (3/8)*x // - (3/8)*x
48-((3/8)*x) = 0
(-3/8)*x+48 = 0
48-3/8*x = 0 // - 48
-3/8*x = -48 // : -3/8
x = -48/(-3/8)
x = 128
x = 128
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