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x in (-oo:+oo)
8.1/2.7 = x/2.3 // - x/2.3
8.1/2.7-(x/2.3) = 0
8.1/2.7-0.43478261*x = 0
3-0.43478261*x = 0 // - 3
-0.43478261*x = -3 // : -0.43478261
x = -3/(-0.43478261)
x = 6.89999998
x = 6.89999998
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