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m in (-oo:+oo)
6*m+(1/2)*m+10 = -71/2 // + -71/2
6*m+(1/2)*m-(-71/2)+10 = 0
6*m+(1/2)*m+71/2+10 = 0
13/2*m+91/2 = 0 // - 91/2
13/2*m = -91/2 // : 13/2
m = -91/2/13/2
m = -7
m = -7
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