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x in (-oo:+oo)
3-((4/5)*x) = 19/5 // - 19/5
3-((4/5)*x)-(19/5) = 0
(-4/5)*x-19/5+3 = 0
-4/5*x-4/5 = 0 // + 4/5
-4/5*x = 4/5 // : -4/5
x = 4/5/(-4/5)
x = -1
x = -1
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