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X in (-oo:+oo)
X/(-10) = 7/4 // - 7/4
X/(-10)-(7/4) = 0
X/(-10)-7/4 = 0
-1/10*X-7/4 = 0 // + 7/4
-1/10*X = 7/4 // : -1/10
X = 7/4/(-1/10)
X = -35/2
X = -35/2
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