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m in (-oo:+oo)
5*m = -30/7 // + -30/7
5*m-(-30/7) = 0
5*m+30/7 = 0
5*m+30/7 = 0 // - 30/7
5*m = -30/7 // : 5
m = -30/7/5
m = -6/7
m = -6/7
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