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