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