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...-1/4 =x...............
2) 3×+¹/₇ =×-1..........[-x-¹/₇
...2x=-8/7...............[ / 2
...x=-2/3................
x=¼+2x [-2x
-x=¼ [:(-1)
x=-¼
2) 3×+¹/₇ =×-1 [-¹/₇
3x=x-1¹/₇ [-x
2x=-1 ¹/₇ [:2
x=-⁴/₇