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(1/5)*x-((1/6)*(x-9)) = 6*x // - 6*x
(1/5)*x-((1/6)*(x-9))-(6*x) = 0
(-1/6)*(x-9)+(1/5)*x-6*x = 0
x/5-1/6*(x-9)-6*x = 0
(-1/6*5*(x-9))/5+x/5+(-6*5*x)/5 = 0
x-1/6*5*(x-9)-6*5*x = 0
1/6*x-30*x+15/2 = 0
15/2-179/6*x = 0
(15/2-179/6*x)/5 = 0
(15/2-179/6*x)/5 = 0 // * 5
15/2-179/6*x = 0
15/2-179/6*x = 0 // - 15/2
-179/6*x = -15/2 // : -179/6
x = -15/2/(-179/6)
x = 45/179
x = 45/179
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