Answer :

m in (-oo:+oo) m+11 = (1/4)*m-(2*m) // - (1/4)*m-(2*m) m-((1/4)*m)+2*m+11 = 0 m+(-1/4)*m+2*m+11 = 0 11/4*m+11 = 0 // - 11 11/4*m = -11 // : 11/4 m = -11/11/4 m = -4 m = -4
First subtract m over to 11=1/4m-2m-m then factor out an m so 11= m(1/4-2-1) so 11=m(-11/4) then divide over m=-4