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m in (-oo:+oo)
4*m+1/2 = -27/10 // + -27/10
4*m+1/2-(-27/10) = 0
4*m+1/2+27/10 = 0
4*m+16/5 = 0 // - 16/5
4*m = -16/5 // : 4
m = -16/5/4
m = -4/5
m = -4/5
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