Final answer:
To make the equation true, place the parentheses around (2+6) in the expression 5*2+6-10/2-86=-51. This preserves the correct order of operations.
Step-by-step explanation:
To make the equation 5*2+6-10/2-86=-51 true, you need to place the set of parentheses in the expression. One possible placement of parentheses would be: 5*(2+6)-10/2-86=-51.
By placing parentheses around (2+6), you ensure that the addition of 2 and 6 is performed first before multiplying by 5. This preserves the correct order of operations, known as PEMDAS (Parentheses, Exponents, Multiplication and Division from left to right, and Addition and Subtraction from left to right).
So, with the correct placement of parentheses, the equation becomes: 5*(2+6)-10/2-86=-51.
Learn more about Order of operations in mathematics