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x in (-oo:+oo)
28 = (-4/3)*x // - (-4/3)*x
28-((-4/3)*x) = 0
(4/3)*x+28 = 0
4/3*x+28 = 0 // - 28
4/3*x = -28 // : 4/3
x = -28/4/3
x = -21
x = -21
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