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m in (-oo:+oo)
4*(2/7)*m-18 = 12 // - 12
4*(2/7)*m-18-12 = 0
8/7*m-30 = 0 // + 30
8/7*m = 30 // : 8/7
m = 30/8/7
m = 105/4
m = 105/4
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