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x in (-oo:+oo)
4-5*x = 5*x-16 // - 5*x-16
4-5*x-(5*x)+16 = 0
4-5*x-5*x+16 = 0
20-10*x = 0 // - 20
-10*x = -20 // : -10
x = -20/(-10)
x = 2
x = 2
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