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m in (-oo:+oo)
m+1/7 = (3/4)*m-(1/2) // - (3/4)*m-(1/2)
m-((3/4)*m)+1/7+1/2 = 0
m+(-3/4)*m+1/7+1/2 = 0
1/4*m+9/14 = 0 // - 9/14
1/4*m = -9/14 // : 1/4
m = -9/14/1/4
m = -18/7
m = -18/7
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