3:5=【X—(20%+136)】:(20%+136)

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3:5=【X—(20%+136)】:(20%+136)
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3:5=【X—(20%+136)】:(20%+136)
3:5=【X—(20%+136)】:(20%+136)

3:5=【X—(20%+136)】:(20%+136)
(8-5):5 = 3:5 = 【X—(20%+136)】:(20%+136)
X = (20%+136)* 8/5 = (20%*8/5+136*8/5) = (32% + 217.6)