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(4*x)/16 = 20/4 // - 20/4
(4*x)/16-(20/4) = 0
(4*x)/16-5 = 0
1/4*x-5 = 0 // + 5
1/4*x = 5 // : 1/4
x = 5/1/4
x = 20
x = 20
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