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x-(4*y)-4;5*y-2*x+2
(4.5-x-y)/4+x-x+y-y-4.65+4.5;2*x+y-0.7
100-(10*x^(1/2))
(4.5-x-y)/4+x-x+y-y-4.65+4.5;2*x+y-0.7
500*(12/100)
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