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x in (-oo:+oo)
5/13 = x/7.5 // - x/7.5
5/13-(x/7.5) = 0
5/13-0.13333333*x = 0
5/13-0.13333333*x = 0 // - 5/13
-0.13333333*x = -5/13 // : -0.13333333
x = -5/13/(-0.13333333)
x = 2.88461542
x = 2.88461542
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