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x in (-oo:+oo)
(x+16)/3+3*x = 0
(x+16)/3+(3*3*x)/3 = 0
x+3*3*x+16 = 0
10*x+16 = 0
(10*x+16)/3 = 0
(10*x+16)/3 = 0 // * 3
10*x+16 = 0
10*x+16 = 0 // - 16
10*x = -16 // : 10
x = -16/10
x = -8/5
x = -8/5
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