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(3/8)*x+40 = y // - y
(3/8)*x-y+40 = 0
3/8*x-y+40 = 0 // - 40-y
3/8*x = -(40-y) // : 3/8
x = (-(40-y))/3/8
x = 8/3*(y-40)
x = 8/3*(y-40)
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