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(5*5*x^1)/2 = 4 // - 4
(5*5*x^1)/2-4 = 0
(5*5*x)/2-4 = 0
25/2*x-4 = 0 // + 4
25/2*x = 4 // : 25/2
x = 4/25/2
x = 8/25
x = 8/25
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