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x in (-oo:+oo)
49 = (-7/9)*x // - (-7/9)*x
49-((-7/9)*x) = 0
(7/9)*x+49 = 0
7/9*x+49 = 0 // - 49
7/9*x = -49 // : 7/9
x = -49/7/9
x = -63
x = -63
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