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m in (-oo:+oo)
7*m+9 = (2/7)*m-454/7 // - (2/7)*m-454/7
7*m-((2/7)*m)-(-454/7)+9 = 0
7*m+(-2/7)*m+454/7+9 = 0
47/7*m+517/7 = 0 // - 517/7
47/7*m = -517/7 // : 47/7
m = -517/7/47/7
m = -11
m = -11
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