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50*x+100*y = 2000/50 // - 2000/50
50*x+100*y-(2000/50) = 0
50*x+100*y-40 = 0
50*x+100*y-40 = 0 // - 100*y-40
50*x = -(100*y-40) // : 50
x = (-(100*y-40))/50
x = (40-(100*y))/50
x = (40-(100*y))/50
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