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x in (-oo:+oo)
x/5-16 = 3*x // - 3*x
x/5-(3*x)-16 = 0
x/5-3*x-16 = 0
-14/5*x-16 = 0 // + 16
-14/5*x = 16 // : -14/5
x = 16/(-14/5)
x = -40/7
x = -40/7
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