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m in (-oo:+oo)
2*(-(5*m)-6) = 58 // - 58
2*(-(5*m)-6)-58 = 0
2*(-5*m-6)-58 = 0
2*(-5*m-6)-58 = 0
-10*m-70 = 0
-10*m-70 = 0
-10*m-70 = 0 // + 70
-10*m = 70 // : -10
m = 70/(-10)
m = -7
m = -7
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