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x in (-oo:+oo)
3*x+x+27/6+42/7 = 15 // - 15
3*x+x+27/6+42/7-15 = 0
4*x-9/2 = 0 // + 9/2
4*x = 9/2 // : 4
x = 9/2/4
x = 9/8
x = 9/8
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