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