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m in (-oo:+oo)
(-1/2)*m+6*m+6/7 = 101/28 // - 101/28
(-1/2)*m+6*m+6/7-(101/28) = 0
(-1/2)*m+6*m+6/7-101/28 = 0
11/2*m-11/4 = 0 // + 11/4
11/2*m = 11/4 // : 11/2
m = 11/4/11/2
m = 1/2
m = 1/2
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