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m in (-oo:+oo)
m-((4*m)/7) = 12 // - 12
m-((4*m)/7)-12 = 0
m+(-4/7)*m-12 = 0
3/7*m-12 = 0 // + 12
3/7*m = 12 // : 3/7
m = 12/3/7
m = 28
m = 28
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