It does not matter. The statement, as given, cannot be made true using only parentheses.
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To clarify the order of operations in the math problem, you can use parentheses as follows: (3 times 42) plus (84 divide by 2) plus (2) equals 56.
12
assuming that there are no parentheses around the (7-1) then it should be 10.7
Lets take the word problem and set it up into a mathematical problem. Twenty one plus four times twelve: 21 + 4(12). Always start with parentheses first. 21 + 48. Now do the addition. 21 + 48 = 69.
(-2)^3 equals -2 times -2 times -2 which equals -8