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D e a r s t u d e n t, 3 . 12 + (8 + 7) = (12 + 8) + 7 A s s o c i a t i v e L a w o f A d d i t i o n O p t i o n C i s c o r r e c t 4 . 5 (9 - 7) = 5 \times 9 - 5 \times 7 D i s t r i b u t i v e L a w o f A d d i t i o n O p t i o n D i s c o r r e c t R e g a r d s

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