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The commutative property of addition should first be applied to rearrange the terms of the expression.
By applying the commutative property, the expression 6a-14b+3a-6+21b-18a can be rewritten as:
(6a + 3a - 18a) + (-14b + 21b) + (-6)
Simplifying the expression further:
-9a + 7b - 6
Therefore, the expression 6a-14b+3a-6+21b-18a is equivalent to -9a+7b-6.