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(5*x)/200+1/2 = 13 // - 13
(5*x)/200+1/2-13 = 0
1/40*x-25/2 = 0 // + 25/2
1/40*x = 25/2 // : 1/40
x = 25/2/1/40
x = 500
x = 500
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