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(-2/3)*(12*x-21)-(5*x) = 0
(-2/3)*(12*x-21)-5*x = 0
-2/3*(12*x-21)-5*x = 0
-2/3*(12*x-21)-5*x = 0
14-13*x = 0
14-13*x = 0
14-13*x = 0 // - 14
-13*x = -14 // : -13
x = -14/(-13)
x = 14/13
x = 14/13
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