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m in (-oo:+oo)
-111 = 90*m-(-45/5) // - 90*m-(-45/5)
-(90*m)-45/5-111 = 0
-90*m-45/5-111 = 0
-90*m-120 = 0 // + 120
-90*m = 120 // : -90
m = 120/(-90)
m = -4/3
m = -4/3
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