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2*x = 20-(y/8) // - 20-(y/8)
2*x+y/8-20 = 0
2*x+1/8*y-20 = 0 // - 1/8*y-20
2*x = -(1/8*y-20) // : 2
x = (-(1/8*y-20))/2
x = (20-(1/8*y))/2
x = (20-(1/8*y))/2
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