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m in (-oo:+oo)
(3/5)*m+3/4 = 7*m+259/4 // - 7*m+259/4
(3/5)*m-(7*m)+3/4-(259/4) = 0
(3/5)*m-7*m+3/4-259/4 = 0
-32/5*m-64 = 0 // + 64
-32/5*m = 64 // : -32/5
m = 64/(-32/5)
m = -10
m = -10
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