Solve for the Missing Number: 7-?+4+2×18=29 Using Order of Operations

First, we place the multiplication exercise in parentheses:

$7-?+4+(2\times18)=29$

We solve the exercise in parentheses:

$2\times18=36$

Now we obtain the exercise:

$7-?+4+36=29$

We reduce the addition exercise:

$36+4=40$

Now we obtain the exercise:

$7-?+40=29$

The question mark is the unknown, therefore we will refer to the exercise as an equation.

We arrange the exercise to isolate the question mark:

$40+7-?=29$

We reduce:

$47-?=29$

We move 47 to the other side and change to the correct sign:

$-?=29-47$

$-?=-18$

We divide both sides by -1 to change to the correct sign:

$?=18$