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x in (-oo:+oo)
7/2 = (-1/7)*x // - (-1/7)*x
7/2-((-1/7)*x) = 0
(1/7)*x+7/2 = 0
1/7*x+7/2 = 0 // - 7/2
1/7*x = -7/2 // : 1/7
x = -7/2/1/7
x = -49/2
x = -49/2
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