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x in (-oo:+oo)
(2/5)*w = (1/2)*x+1 // - (1/2)*x+1
(2/5)*w-((1/2)*x)-1 = 0
(2/5)*w+(-1/2)*x-1 = 0
2/5*w-1/2*x-1 = 0 // - 2/5*w-1
-1/2*x = -(2/5*w-1) // : -1/2
x = (-(2/5*w-1))/(-1/2)
x = -2*(1-(2/5*w))
x = -2*(1-(2/5*w))
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