
Concept explainers
To solve: The equation

Answer to Problem 1ECP
The value of the unknown variable X is 230.
Explanation of Solution
Result used:
Opposite process rule:
“If an equation indicates a process such as addition, subtraction, multiplication, or division, solve for the unknown or variable by using the opposite process.”
Calculation:
The given equation is
This equation means that, ‘Some number X less 20 equals 210.
Since the equation process used subtraction, use the opposite process rule and solve for the variable X with addition.
To isolate the variable X on the left, add 20 to both sides of the equation.
That is,
Check the result by substituting
Thus, the value of the unknown variable X is 230.
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