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x in (-oo:+oo)
-8 = (4/5)*x // - (4/5)*x
-((4/5)*x)-8 = 0
(-4/5)*x-8 = 0
-4/5*x-8 = 0 // + 8
-4/5*x = 8 // : -4/5
x = 8/(-4/5)
x = -10
x = -10
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