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m in (-oo:+oo)
m/7 = -1/2 // + -1/2
m/7-(-1/2) = 0
m/7+1/2 = 0
1/7*m+1/2 = 0 // - 1/2
1/7*m = -1/2 // : 1/7
m = -1/2/1/7
m = -7/2
m = -7/2
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