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X in (-oo:+oo)
7.5/4.3 = X/3.75 // - X/3.75
7.5/4.3-(X/3.75) = 0
7.5/4.3-0.26666667*X = 0
1.74418605-0.26666667*X = 0 // - 1.74418605
-0.26666667*X = -1.74418605 // : -0.26666667
X = -1.74418605/(-0.26666667)
X = 6.54069761
X = 6.54069761
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