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=> (30a - 40) - 6 - 8a
=> 30a - 8a - 40 - 6
=> 22a - 46
=> 2(11a - 23)
= (-10 × -3a) + (-10 × 4) - 6 - 8a
= 30a - 40 - 6 - 8a
= 30a - 8a - 40 - 6
= 22a - 46