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-((6/5)*(x-20))-((1/10)*x) = 0
(-6/5)*(x-20)+(-1/10)*x = 0
-6/5*(x-20)-x/10 = 0
(-6/5*10*(x-20))/10-x/10 = 0
-6/5*10*(x-20)-x = 0
240-13*x = 0
(240-13*x)/10 = 0
(240-13*x)/10 = 0 // * 10
240-13*x = 0
240-13*x = 0 // - 240
-13*x = -240 // : -13
x = -240/(-13)
x = 240/13
x = 240/13
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