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m in (-oo:+oo)
2/15 = m/67.5 // - m/67.5
2/15-(m/67.5) = 0
2/15-0.01481481*m = 0
2/15-0.01481481*m = 0 // - 2/15
-0.01481481*m = -2/15 // : -0.01481481
m = -2/15/(-0.01481481)
m = 9.0000027
m = 9.0000027
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