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m in (-oo:+oo)
-(4*m)-8 = 6*m-18 // - 6*m-18
18-(4*m)-(6*m)-8 = 0
18-4*m-6*m-8 = 0
10-10*m = 0 // - 10
-10*m = -10 // : -10
m = -10/(-10)
m = 1
m = 1
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