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m in (-oo:+oo)
(3/7)*m = -3/7 // + -3/7
(3/7)*m-(-3/7) = 0
(3/7)*m+3/7 = 0
3/7*m+3/7 = 0 // - 3/7
3/7*m = -3/7 // : 3/7
m = -3/7/3/7
m = -1
m = -1
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