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(13*x)/4 = 39/8 // - 39/8
(13*x)/4-(39/8) = 0
(13*x)/4-39/8 = 0
13/4*x-39/8 = 0 // + 39/8
13/4*x = 39/8 // : 13/4
x = 39/8/13/4
x = 3/2
x = 3/2
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