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(2*x-10)/9 = 4/10 // - 4/10
(2*x-10)/9-(4/10) = 0
(2*x-10)/9-2/5 = 0
(5*(2*x-10))/(5*9)+(-2*9)/(5*9) = 0
5*(2*x-10)-2*9 = 0
10*x-68 = 0
(10*x-68)/(5*9) = 0
(10*x-68)/(5*9) = 0 // * 5*9
10*x-68 = 0
10*x-68 = 0 // + 68
10*x = 68 // : 10
x = 68/10
x = 34/5
x = 34/5
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