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(2/5)*y = 4-(2*x) // - 4-(2*x)
2*x+(2/5)*y-4 = 0
2*x+2/5*y-4 = 0 // - 2/5*y-4
2*x = -(2/5*y-4) // : 2
x = (-(2/5*y-4))/2
x = (4-(2/5*y))/2
x = (4-(2/5*y))/2
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