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m in (-oo:+oo)
89/13-(52/13) = 11*m // - 11*m
89/13-(11*m)-(52/13) = 0
89/13-11*m-4 = 0
37/13-11*m = 0 // - 37/13
-11*m = -37/13 // : -11
m = -37/13/(-11)
m = 37/143
m = 37/143
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