2. Доведіть тотожність:
1) a - (3a - 21)+(15-2a) = 36-4a;
2) 8(3x + 4)-6(3x - 12) + 4x = 5(2x - 3) + 119; 3) 18 - 8(c + ¾ ) +5c - 24 = c - (4c + 12).
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