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m in (-oo:+oo)
21/17 = -7*m // + -7*m
21/17-(-7*m) = 0
7*m+21/17 = 0
7*m+21/17 = 0 // - 21/17
7*m = -21/17 // : 7
m = -21/17/7
m = -3/17
m = -3/17
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