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X/9 = (5*x)/6-13 // - (5*x)/6-13
X/9-((5*x)/6)+13 = 0
X/9+(-5/6)*x+13 = 0
1/9*X-5/6*x+13 = 0 // - 1/9*X+13
-5/6*x = -(1/9*X+13) // : -5/6
x = (-(1/9*X+13))/(-5/6)
x = 6/5*(1/9*X+13)
x = 6/5*(1/9*X+13)
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