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m in (-oo:+oo)
4*m-((1/3)*m)+3/8 = 697/216 // - 697/216
4*m-((1/3)*m)+3/8-(697/216) = 0
4*m+(-1/3)*m+3/8-697/216 = 0
11/3*m-77/27 = 0 // + 77/27
11/3*m = 77/27 // : 11/3
m = 77/27/11/3
m = 7/9
m = 7/9
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