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m in (-oo:+oo)
3-5*m = -3*m-11 // + -3*m-11
3-5*m-(-3*m)+11 = 0
3*m-5*m+3+11 = 0
14-2*m = 0 // - 14
-2*m = -14 // : -2
m = -14/(-2)
m = 7
m = 7
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