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x in (-oo:+oo)
3*x+x+27/6+13/5 = 12 // - 12
3*x+x+27/6+13/5-12 = 0
4*x-49/10 = 0 // + 49/10
4*x = 49/10 // : 4
x = 49/10/4
x = 49/40
x = 49/40
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