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Let "x" represent the number of questions the student got wrong.
The total points the student received on the test can be calculated using the formula:
Total points = Total possible points - (Points deducted per wrong answer * Number of wrong answers)
Substituting the given values:
Total points = 100 - (2 * x)
Therefore, the expression to find the student's test score if they got x questions wrong is:
100 - (2 * x)