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m in (-oo:+oo)
m+m+3/4-7 = -13 // + 13
m+m+3/4-7+13 = 0
2*m+27/4 = 0 // - 27/4
2*m = -27/4 // : 2
m = -27/4/2
m = -27/8
m = -27/8
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