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(5/2)*x+x-(4/2) = 11 // - 11
(5/2)*x+x-(4/2)-11 = 0
(5/2)*x+x-11-2 = 0
7/2*x-13 = 0 // + 13
7/2*x = 13 // : 7/2
x = 13/7/2
x = 26/7
x = 26/7
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