Answer:
.
Explanation:
Apply the associative property of addition to rewrite the left-hand side of the equation.
The two addition operators on the left-hand side are typically evaluated from left to right.
.
However, by the associative property of addition, the second addition can be evaluated before the first:
.
.
Move all terms with the unknown (
in this case) to one side of the equation and move all numbers to the other side. For example, add
to both side of this equation will move the number
to the right-hand side.
.
.
Multiply both sides of the equation by
to find the value of
.
.