Answer :

12(3(7)+5(7))
12(21)+(35))
12(56)
684

Answer: 672

Step-by-step explanation:

12(3x+5x) -> 12(3(7)+5(7))

Solve for parentheses, 3(7)=21, 5(7)=35

21+35=56, 56(12)=672

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