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x in (-oo:+oo)
6.5/12.3 = x/9.8 // - x/9.8
6.5/12.3-(x/9.8) = 0
6.5/12.3-0.10204082*x = 0
0.52845528-0.10204082*x = 0 // - 0.52845528
-0.10204082*x = -0.52845528 // : -0.10204082
x = -0.52845528/(-0.10204082)
x = 5.17886156
x = 5.17886156
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