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x in (-oo:+oo)
3*x+x+15/4+14/7 = 12 // - 12
3*x+x+15/4+14/7-12 = 0
4*x-25/4 = 0 // + 25/4
4*x = 25/4 // : 4
x = 25/4/4
x = 25/16
x = 25/16
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