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X in (-oo:+oo)
3-((4/5)*X) = 5/2 // - 5/2
3-((4/5)*X)-(5/2) = 0
(-4/5)*X-5/2+3 = 0
1/2-4/5*X = 0 // - 1/2
-4/5*X = -1/2 // : -4/5
X = -1/2/(-4/5)
X = 5/8
X = 5/8
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