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13*x-((4/3)*(2*x-5)) = 15 // - 15
13*x-((4/3)*(2*x-5))-15 = 0
(-4/3)*(2*x-5)+13*x-15 = 0
13*x-4/3*(2*x-5)-15 = 0
13*x-4/3*(2*x-5)-15 = 0
31/3*x-15+20/3 = 0
31/3*x-25/3 = 0
31/3*x-25/3 = 0
31/3*x-25/3 = 0 // + 25/3
31/3*x = 25/3 // : 31/3
x = 25/3/31/3
x = 25/31
x = 25/31
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