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m in (-oo:+oo)
2*m+1/5 = 12 // - 12
2*m+1/5-12 = 0
2*m-59/5 = 0 // + 59/5
2*m = 59/5 // : 2
m = 59/5/2
m = 59/10
m = 59/10
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