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x in (-oo:+oo)
(2*x)/(-5)-10 = -8 // + 8
(2*x)/(-5)-10+8 = 0
-2/5*x-2 = 0 // + 2
-2/5*x = 2 // : -2/5
x = 2/(-2/5)
x = -5
x = -5
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