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(2*x)/15 = 4/5 // - 4/5
(2*x)/15-(4/5) = 0
(2*x)/15-4/5 = 0
2/15*x-4/5 = 0 // + 4/5
2/15*x = 4/5 // : 2/15
x = 4/5/2/15
x = 6
x = 6
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