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m in (-oo:+oo)
6*m-((6/7)*m)-3 = 33 // - 33
6*m-((6/7)*m)-33-3 = 0
6*m+(-6/7)*m-33-3 = 0
36/7*m-36 = 0 // + 36
36/7*m = 36 // : 36/7
m = 36/36/7
m = 7
m = 7
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