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m in (-oo:+oo)
4*m-((4/7)*m)+3/7 = 65/21 // - 65/21
4*m-((4/7)*m)+3/7-(65/21) = 0
4*m+(-4/7)*m+3/7-65/21 = 0
24/7*m-8/3 = 0 // + 8/3
24/7*m = 8/3 // : 24/7
m = 8/3/24/7
m = 7/9
m = 7/9
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