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(5/6)*x+4 = 23/2 // - 23/2
(5/6)*x-(23/2)+4 = 0
(5/6)*x-23/2+4 = 0
5/6*x-15/2 = 0 // + 15/2
5/6*x = 15/2 // : 5/6
x = 15/2/5/6
x = 9
x = 9
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