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m in (-oo:+oo)
(1/4)*(m+12)+(3/4)*m = -1 // + 1
(1/4)*(m+12)+(3/4)*m+1 = 0
1/4*(m+12)+(3*m)/4+1 = 0
(1/4*4*(m+12))/4+(3*m)/4+(1*4)/4 = 0
1/4*4*(m+12)+3*m+1*4 = 0
4*m+4+12 = 0
4*m+16 = 0
(4*m+16)/4 = 0
(4*m+16)/4 = 0 // * 4
4*m+16 = 0
4*m+16 = 0 // - 16
4*m = -16 // : 4
m = -16/4
m = -4
m = -4
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