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(1/9)*(18-9*x)-((1/5)*(15*x+10)) = 0
(1/9)*(18-9*x)+(-1/5)*(15*x+10) = 0
1/9*(18-9*x)-1/5*(15*x+10) = 0
1/9*(18-9*x)-1/5*(15*x+10) = 0
-4*x = 0
-4*x = 0
-4*x = 0 // : -4
x = 0
x = 0
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