It only needs a single step to solve a one-step equation. We will use the idea of inverse operations to isolate the variable that we are trying to solve.
Addition and subtraction are inverses of each other.
Multiplication and division are inverses of each other.
Example 1:
$$\eqalign{
x + 5 &= 7 \cr
x + 5 - 5 &= 7 - 5 \cr
x &= 2 \cr} $$
Example 2:
$$\eqalign{
y - 3 &= 4 \cr
y - 3 + 3 &= 4 + 3 \cr
y &= 7 \cr} $$