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(2/5)*(10*x-5) = 26 // - 26
(2/5)*(10*x-5)-26 = 0
2/5*(10*x-5)-26 = 0
2/5*(10*x-5)-26 = 0
4*x-28 = 0
4*x-28 = 0
4*x-28 = 0 // + 28
4*x = 28 // : 4
x = 28/4
x = 7
x = 7
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