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