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m in (-oo:+oo)
6*m-(4*m)+4 = 26 // - 26
6*m-(4*m)-26+4 = 0
6*m-4*m-26+4 = 0
2*m-22 = 0 // + 22
2*m = 22 // : 2
m = 22/2
m = 11
m = 11
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