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m in (-oo:+oo)
(8/7)*m-(36/7) = 12 // - 12
(8/7)*m-(36/7)-12 = 0
(8/7)*m-36/7-12 = 0
8/7*m-120/7 = 0 // + 120/7
8/7*m = 120/7 // : 8/7
m = 120/7/8/7
m = 15
m = 15
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