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y = (5/9)*x-((l^60)/9) // - (5/9)*x-((l^60)/9)
(l^60)/9-((5/9)*x)+y = 0
(l^60)/9+(-5/9)*x+y = 0
1/9*l^60-5/9*x+y = 0 // - 1/9*l^60+y
-5/9*x = -(1/9*l^60+y) // : -5/9
x = (-(1/9*l^60+y))/(-5/9)
x = 9/5*(1/9*l^60+y)
x = 9/5*(1/9*l^60+y)
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