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x in (-oo:+oo)
16 = (2/5)*x // - (2/5)*x
16-((2/5)*x) = 0
(-2/5)*x+16 = 0
16-2/5*x = 0 // - 16
-2/5*x = -16 // : -2/5
x = -16/(-2/5)
x = 40
x = 40
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