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x in (-oo:+oo)
(-4/5)*x = 16/15 // - 16/15
(-4/5)*x-(16/15) = 0
(-4/5)*x-16/15 = 0
-4/5*x-16/15 = 0 // + 16/15
-4/5*x = 16/15 // : -4/5
x = 16/15/(-4/5)
x = -4/3
x = -4/3
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