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m in (-oo:+oo)
m/13 = -15/13 // + -15/13
m/13-(-15/13) = 0
m/13+15/13 = 0
1/13*m+15/13 = 0 // - 15/13
1/13*m = -15/13 // : 1/13
m = -15/13/1/13
m = -15
m = -15
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