To solve the equation, we have to isolate r on one side. Here, we can start by subtracting 80 from both sides of the equation using the Subtraction Property of Equality. This means that we can fill the first two boxes with 80.
80 + r &= 160
80 + r -80 &= 160 -80
r &=
Now, let's perform the subtraction to find the value of r and complete the boxes! On the left-hand side we will end with r and on the right-hand side we will have 80 because 160-80= 80.
80 + r &= 160
80 + r -80 &= 160 -80
r &= 80
