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x in (-oo:+oo)
2/3 = x/7.5 // - x/7.5
2/3-(x/7.5) = 0
2/3-0.13333333*x = 0
2/3-0.13333333*x = 0 // - 2/3
-0.13333333*x = -2/3 // : -0.13333333
x = -2/3/(-0.13333333)
x = 5.00000015
x = 5.00000015
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