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x in (-oo:+oo)
(-2/5)*x-4 = 8 // - 8
(-2/5)*x-8-4 = 0
-2/5*x-12 = 0 // + 12
-2/5*x = 12 // : -2/5
x = 12/(-2/5)
x = -30
x = -30
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