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a in (-oo:+oo)
4*((1/5)*a-(1/2))+(1/2)*a = 11 // - 11
4*((1/5)*a-(1/2))+(1/2)*a-11 = 0
4*((1/5)*a-1/2)+(1/2)*a-11 = 0
4*(1/5*a-1/2)+a/2-11 = 0
(2*4*(1/5*a-1/2))/2+a/2+(-11*2)/2 = 0
2*4*(1/5*a-1/2)+a-11*2 = 0
13/5*a-22-4 = 0
13/5*a-26 = 0
(13/5*a-26)/2 = 0
(13/5*a-26)/2 = 0 // * 2
13/5*a-26 = 0
13/5*a-26 = 0 // + 26
13/5*a = 26 // : 13/5
a = 26/13/5
a = 10
a = 10
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