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m in (-oo:+oo)
(-4/7)*m+m+1/3 = 97/21 // - 97/21
(-4/7)*m+m+1/3-(97/21) = 0
(-4/7)*m+m+1/3-97/21 = 0
3/7*m-30/7 = 0 // + 30/7
3/7*m = 30/7 // : 3/7
m = 30/7/3/7
m = 10
m = 10
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