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m in (-oo:+oo)
(-2/7)*(2*m+6) = (1/28)*m-11 // - (1/28)*m-11
(-2/7)*(2*m+6)-((1/28)*m)+11 = 0
(-2/7)*(2*m+6)+(-1/28)*m+11 = 0
11-2/7*(2*m+6)-m/28 = 0
(-2/7*28*(2*m+6))/28-m/28+(11*28)/28 = 0
11*28-2/7*28*(2*m+6)-m = 0
308-17*m-48 = 0
260-17*m = 0
(260-17*m)/28 = 0
(260-17*m)/28 = 0 // * 28
260-17*m = 0
260-17*m = 0 // - 260
-17*m = -260 // : -17
m = -260/(-17)
m = 260/17
m = 260/17
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