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(2/9)*x+y = 4 // - 4
(2/9)*x+y-4 = 0
2/9*x+y-4 = 0 // - y-4
2/9*x = -(y-4) // : 2/9
x = (-(y-4))/2/9
x = 9/2*(4-y)
x = 9/2*(4-y)
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