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x in (-oo:+oo)
7-4*x-5 = 1/2 // - 1/2
7-4*x-(1/2)-5 = 0
7-4*x-1/2-5 = 0
3/2-4*x = 0 // - 3/2
-4*x = -3/2 // : -4
x = -3/2/(-4)
x = 3/8
x = 3/8
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