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