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x in (-oo:+oo)
6*x+1/7 = 2*x-(2/7) // - 2*x-(2/7)
6*x-(2*x)+1/7+2/7 = 0
6*x-2*x+1/7+2/7 = 0
4*x+3/7 = 0 // - 3/7
4*x = -3/7 // : 4
x = -3/7/4
x = -3/28
x = -3/28
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