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x in (-oo:+oo)
3*x+x+8/5+39/6 = 15 // - 15
3*x+x+8/5+39/6-15 = 0
4*x-69/10 = 0 // + 69/10
4*x = 69/10 // : 4
x = 69/10/4
x = 69/40
x = 69/40
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