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3*x+x+3/4+3/5 = 8 // - 8
3*x+x+3/4+3/5-8 = 0
4*x-133/20 = 0 // + 133/20
4*x = 133/20 // : 4
x = 133/20/4
x = 133/80
x = 133/80
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