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m in (-oo:+oo)
-77/4 = (-1/4)*m+7*m+1 // - (-1/4)*m+7*m+1
-((-1/4)*m)-(7*m)-77/4-1 = 0
(1/4)*m-7*m-77/4-1 = 0
-27/4*m-81/4 = 0 // + 81/4
-27/4*m = 81/4 // : -27/4
m = 81/4/(-27/4)
m = -3
m = -3
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