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x in (-oo:+oo)
-101/14 = (-1/2)*x+(4/7)*x-7 // - (-1/2)*x+(4/7)*x-7
7-((-1/2)*x)-((4/7)*x)-101/14 = 0
(1/2)*x+(-4/7)*x-101/14+7 = 0
-1/14*x-3/14 = 0 // + 3/14
-1/14*x = 3/14 // : -1/14
x = 3/14/(-1/14)
x = -3
x = -3
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