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m in (-oo:+oo)
(-6/7)*m+4/5 = 22/35 // - 22/35
(-6/7)*m+4/5-(22/35) = 0
(-6/7)*m+4/5-22/35 = 0
6/35-6/7*m = 0 // - 6/35
-6/7*m = -6/35 // : -6/7
m = -6/35/(-6/7)
m = 1/5
m = 1/5
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