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x in (-oo:+oo)
(1/2)*x = (1/20)*y-1 // - (1/20)*y-1
(1/2)*x-((1/20)*y)+1 = 0
(1/2)*x+(-1/20)*y+1 = 0
1/2*x-1/20*y+1 = 0 // - 1-1/20*y
1/2*x = -(1-1/20*y) // : 1/2
x = (-(1-1/20*y))/1/2
x = -2*(1-1/20*y)
x = -2*(1-1/20*y)
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