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m in (-oo:+oo)
-5*m-9 = 4*m-99 // - 4*m-99
99-5*m-(4*m)-9 = 0
99-5*m-4*m-9 = 0
90-9*m = 0 // - 90
-9*m = -90 // : -9
m = -90/(-9)
m = 10
m = 10
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