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m in (-oo:+oo)
4*m+2/9 = (1/7)*m-25/252 // - (1/7)*m-25/252
4*m-((1/7)*m)+2/9-(-25/252) = 0
4*m+(-1/7)*m+2/9+25/252 = 0
27/7*m+9/28 = 0 // - 9/28
27/7*m = -9/28 // : 27/7
m = -9/28/27/7
m = -1/12
m = -1/12
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