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4*x = ((2/(-2))*y)/4 // - ((2/(-2))*y)/4
4*x-(((2/(-2))*y)/4) = 0
4*x+(1/4)*y = 0
4*x+1/4*y = 0 // - 1/4*y
4*x = -(1/4*y) // : 4
x = (-(1/4*y))/4
x = -1/16*y
x = -1/16*y
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