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x in (-oo:+oo)
x/2-(7*x) = 8 // - 8
x/2-(7*x)-8 = 0
x/2-7*x-8 = 0
-13/2*x-8 = 0 // + 8
-13/2*x = 8 // : -13/2
x = 8/(-13/2)
x = -16/13
x = -16/13
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