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x in (-oo:+oo)
49 = (-7/3)*x // - (-7/3)*x
49-((-7/3)*x) = 0
(7/3)*x+49 = 0
7/3*x+49 = 0 // - 49
7/3*x = -49 // : 7/3
x = -49/7/3
x = -21
x = -21
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