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7. (3x - 2) / 6 - (x + 4) / 3 = (3x - 2) / 6 - 2 (x + 4) / 6= (3x - 2 - 2x - 8) / 6
= (x - 10) / 6
8. (2a - 3) / 3 + (4 - 3a) / 5 = 5 (2a - 3) / 15 + 3 (4 - 3a) / 15
= (10a - 15 + 12 - 9a) /15
= (a - 3) / 15