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10*x+(5/2)*y = 20 // - 20
10*x+(5/2)*y-20 = 0
10*x+5/2*y-20 = 0 // - 5/2*y-20
10*x = -(5/2*y-20) // : 10
x = (-(5/2*y-20))/10
x = (20-(5/2*y))/10
x = (20-(5/2*y))/10
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