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m in (-oo:+oo)
8-(4*m) = 40 // - 40
8-(4*m)-40 = 0
8-4*m-40 = 0
-4*m-32 = 0 // + 32
-4*m = 32 // : -4
m = 32/(-4)
m = -8
m = -8
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