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x in (-oo:+oo)
49 = (-7/2)*x // - (-7/2)*x
49-((-7/2)*x) = 0
(7/2)*x+49 = 0
7/2*x+49 = 0 // - 49
7/2*x = -49 // : 7/2
x = -49/7/2
x = -14
x = -14
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