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x/2+y/4-(3/4) = 0
x/2+y/4-3/4 = 0
1/2*x+1/4*y-3/4 = 0 // - 1/4*y-3/4
1/2*x = -(1/4*y-3/4) // : 1/2
x = (-(1/4*y-3/4))/1/2
x = 2*(3/4-(1/4*y))
x = 2*(3/4-(1/4*y))
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