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x in (-oo:+oo)
49 = (-7/6)*x // - (-7/6)*x
49-((-7/6)*x) = 0
(7/6)*x+49 = 0
7/6*x+49 = 0 // - 49
7/6*x = -49 // : 7/6
x = -49/7/6
x = -42
x = -42
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