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m in (-oo:+oo)
(-2/7)*m = 7/9 // - 7/9
(-2/7)*m-(7/9) = 0
(-2/7)*m-7/9 = 0
-2/7*m-7/9 = 0 // + 7/9
-2/7*m = 7/9 // : -2/7
m = 7/9/(-2/7)
m = -49/18
m = -49/18
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