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m in (-oo:+oo)
(-4/5)*m-(3/4) = -63/20 // + -63/20
(-4/5)*m-(3/4)-(-63/20) = 0
(-4/5)*m-3/4+63/20 = 0
12/5-4/5*m = 0 // - 12/5
-4/5*m = -12/5 // : -4/5
m = -12/5/(-4/5)
m = 3
m = 3
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