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