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