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x in (-oo:+oo)
(1/3)*(9*x+12)+x = -16 // + 16
(1/3)*(9*x+12)+x+16 = 0
1/3*(9*x+12)+x+16 = 0
1/3*(9*x+12)+x+16 = 0
4*x+4+16 = 0
4*x+20 = 0
4*x+20 = 0
4*x+20 = 0 // - 20
4*x = -20 // : 4
x = -20/4
x = -5
x = -5
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