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m in (-oo:+oo)
6*m+1/4 = -71/4 // + -71/4
6*m+1/4-(-71/4) = 0
6*m+1/4+71/4 = 0
6*m+18 = 0 // - 18
6*m = -18 // : 6
m = -18/6
m = -3
m = -3
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