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m in (-oo:+oo)
(1/2)*(2*m-20) = (1/4)*(8-(8*m)) // - (1/4)*(8-(8*m))
(1/2)*(2*m-20)-((1/4)*(8-(8*m))) = 0
(1/2)*(2*m-20)+(-1/4)*(8-8*m) = 0
1/2*(2*m-20)-1/4*(8-8*m) = 0
1/2*(2*m-20)-1/4*(8-8*m) = 0
3*m-12 = 0
3*m-12 = 0
3*m-12 = 0 // + 12
3*m = 12 // : 3
m = 12/3
m = 4
m = 4
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