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(2*x)/15+4 = 71/5 // - 71/5
(2*x)/15-(71/5)+4 = 0
(2*x)/15-71/5+4 = 0
2/15*x-51/5 = 0 // + 51/5
2/15*x = 51/5 // : 2/15
x = 51/5/2/15
x = 153/2
x = 153/2
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