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(3/5)*(10-(9*x))-((1/4)*(18*x+7)) = 0
(3/5)*(10-9*x)+(-1/4)*(18*x+7) = 0
3/5*(10-9*x)-1/4*(18*x+7) = 0
3/5*(10-9*x)-1/4*(18*x+7) = 0
17/4-99/10*x = 0
17/4-99/10*x = 0
17/4-99/10*x = 0 // - 17/4
-99/10*x = -17/4 // : -99/10
x = -17/4/(-99/10)
x = 85/198
x = 85/198
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