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x in (-oo:+oo)
-8*x-(7/2) = 0
-8*x-7/2 = 0
-8*x-7/2 = 0 // + 7/2
-8*x = 7/2 // : -8
x = 7/2/(-8)
x = -7/16
x = -7/16
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