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