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(4*x)/20 = 10/2 // - 10/2
(4*x)/20-(10/2) = 0
(4*x)/20-5 = 0
1/5*x-5 = 0 // + 5
1/5*x = 5 // : 1/5
x = 5/1/5
x = 25
x = 25
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