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y in (-oo:+oo)
5*(2-((1/2)*y)) = 1-((1/4)*y)+4 // - 1-((1/4)*y)+4
5*(2-((1/2)*y))+(1/4)*y-4-1 = 0
5*((-1/2)*y+2)+(1/4)*y-4-1 = 0
5*(2-1/2*y)+y/4-4-1 = 0
(4*5*(2-1/2*y))/4+y/4+(-4*4)/4+(-1*4)/4 = 0
4*5*(2-1/2*y)+y-4*4-1*4 = 0
40-9*y-16-4 = 0
24-9*y-4 = 0
20-9*y = 0
(20-9*y)/4 = 0
(20-9*y)/4 = 0 // * 4
20-9*y = 0
20-9*y = 0 // - 20
-9*y = -20 // : -9
y = -20/(-9)
y = 20/9
y = 20/9
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