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