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x in (-oo:+oo)
28 = (-7/9)*x // - (-7/9)*x
28-((-7/9)*x) = 0
(7/9)*x+28 = 0
7/9*x+28 = 0 // - 28
7/9*x = -28 // : 7/9
x = -28/7/9
x = -36
x = -36
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