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m in (-oo:+oo)
3*m+3 = 4*m-8 // - 4*m-8
3*m-(4*m)+3+8 = 0
3*m-4*m+3+8 = 0
11-m = 0 // - 11
-m = -11 // * -1
m = 11
m = 11
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