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(4*x)/15 = 20/45 // - 20/45
(4*x)/15-(20/45) = 0
(4*x)/15-4/9 = 0
4/15*x-4/9 = 0 // + 4/9
4/15*x = 4/9 // : 4/15
x = 4/9/4/15
x = 5/3
x = 5/3
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