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9*x-(4*y)-(1/5) = 0
9*x-4*y-1/5 = 0
9*x-4*y-1/5 = 0 // + -4*y-1/5
9*x = -(-4*y-1/5) // : 9
x = (-(-4*y-1/5))/9
x = (1/5-(-4*y))/9
x = (1/5-(-4*y))/9
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