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x in (-oo:+oo)
(1/4)*x-((1/5)*(x-8)) = 5*x // - 5*x
(1/4)*x-((1/5)*(x-8))-(5*x) = 0
(-1/5)*(x-8)+(1/4)*x-5*x = 0
x/4-1/5*(x-8)-5*x = 0
(-1/5*4*(x-8))/4+x/4+(-5*4*x)/4 = 0
x-1/5*4*(x-8)-5*4*x = 0
1/5*x-20*x+32/5 = 0
32/5-99/5*x = 0
(32/5-99/5*x)/4 = 0
(32/5-99/5*x)/4 = 0 // * 4
32/5-99/5*x = 0
32/5-99/5*x = 0 // - 32/5
-99/5*x = -32/5 // : -99/5
x = -32/5/(-99/5)
x = 32/99
x = 32/99
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