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m in (-oo:+oo)
8-(4*m) = m-27 // - m-27
8-(4*m)-m+27 = 0
8-4*m-m+27 = 0
35-5*m = 0 // - 35
-5*m = -35 // : -5
m = -35/(-5)
m = 7
m = 7
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