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m in (-oo:+oo)
m-13 = (-8/2)*m // - (-8/2)*m
m-((-8/2)*m)-13 = 0
m+4*m-13 = 0
5*m-13 = 0 // + 13
5*m = 13 // : 5
m = 13/5
m = 13/5
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