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x in (-oo:+oo)
8/2 = x/4.5 // - x/4.5
8/2-(x/4.5) = 0
8/2-0.22222222*x = 0
4-0.22222222*x = 0 // - 4
-0.22222222*x = -4 // : -0.22222222
x = -4/(-0.22222222)
x = 18.00000018
x = 18.00000018
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