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x in (-oo:+oo)
4*c-(x*(y/3)) = 0
4*c-1/3*x*y = 0 // - 4*c
-1/3*x*y = -(4*c) // : -1/3*y
x = (-(4*c))/(-1/3*y)
x = 12*c*y^-1
x = 12*c*y^-1
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