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x in (-oo:+oo)
48 = (8/3)*x // - (8/3)*x
48-((8/3)*x) = 0
(-8/3)*x+48 = 0
48-8/3*x = 0 // - 48
-8/3*x = -48 // : -8/3
x = -48/(-8/3)
x = 18
x = 18
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