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m in (-oo:+oo)
-(4*m)-7 = -55 // + 55
55-(4*m)-7 = 0
55-4*m-7 = 0
48-4*m = 0 // - 48
-4*m = -48 // : -4
m = -48/(-4)
m = 12
m = 12
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