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