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(4*x)/15 = 20/4 // - 20/4
(4*x)/15-(20/4) = 0
(4*x)/15-5 = 0
4/15*x-5 = 0 // + 5
4/15*x = 5 // : 4/15
x = 5/4/15
x = 75/4
x = 75/4
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