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x in (-oo:+oo)
3*x+x+48/7+13/6 = 12 // - 12
3*x+x+48/7+13/6-12 = 0
4*x-125/42 = 0 // + 125/42
4*x = 125/42 // : 4
x = 125/42/4
x = 125/168
x = 125/168
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