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