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m in (-oo:+oo)
(-4/7)*m = 36/7 // - 36/7
(-4/7)*m-(36/7) = 0
(-4/7)*m-36/7 = 0
-4/7*m-36/7 = 0 // + 36/7
-4/7*m = 36/7 // : -4/7
m = 36/7/(-4/7)
m = -9
m = -9
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