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x in (-oo:+oo)
y = 3*w-((v/4)*x) // - 3*w-((v/4)*x)
(v/4)*x-(3*w)+y = 0
(v/4)*x-3*w+y = 0
1/4*v*x-3*w+y = 0 // - y-3*w
1/4*v*x = -(y-3*w) // : 1/4*v
x = (-(y-3*w))/(1/4*v)
x = -4*v^-1*(y-3*w)
x = -4*v^-1*(y-3*w)
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