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m in (-oo:+oo)
12*m+3 = m/4 // - m/4
12*m-(m/4)+3 = 0
47/4*m+3 = 0 // - 3
47/4*m = -3 // : 47/4
m = -3/47/4
m = -12/47
m = -12/47
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