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m in (-oo:+oo)
10/7 = m/10.5 // - m/10.5
10/7-(m/10.5) = 0
10/7-0.0952381*m = 0
10/7-0.0952381*m = 0 // - 10/7
-0.0952381*m = -10/7 // : -0.0952381
m = -10/7/(-0.0952381)
m = 14.99999927
m = 14.99999927
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