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x in (-oo:+oo)
0.6427 = x/7.5 // - x/7.5
0.6427-(x/7.5) = 0
0.6427-0.13333333*x = 0
0.6427-0.13333333*x = 0 // - 0.6427
-0.13333333*x = -0.6427 // : -0.13333333
x = -0.6427/(-0.13333333)
x = 4.82025012
x = 4.82025012
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