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7a – 3b + 10a - 7 =
5x + 12y + 11x – 4y + 8z
2x - 3y + 8x - 10 + 9y – 6 =
3ab - 4x + 3ab – 7 + 4x + 11 =
2x + 3 – 6x + 10 =
zrób ktoś ​