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x in (-oo:+oo)
(2/3)*(x-4) = -16 // + 16
(2/3)*(x-4)+16 = 0
2/3*(x-4)+16 = 0
2/3*(x-4)+16 = 0
2/3*x+40/3 = 0
2/3*x+40/3 = 0
2/3*x+40/3 = 0 // - 40/3
2/3*x = -40/3 // : 2/3
x = -40/3/2/3
x = -20
x = -20
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