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m in (-oo:+oo)
10-(4*m) = 58 // - 58
10-(4*m)-58 = 0
10-4*m-58 = 0
-4*m-48 = 0 // + 48
-4*m = 48 // : -4
m = 48/(-4)
m = -12
m = -12
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