Tell whether the given number is a solution of the equation. 
Definitions:
Forward Selection
A stepwise regression approach where variables are sequentially added to an empty model based on their statistical significance in predicting the outcome.
Significant Contribution
An important or valuable addition or impact that significantly affects an outcome or process.
Stepwise Regression Technique
A method of fitting a regression model by adding or removing predictors based on a specified criterion.
Backward Selection
A stepwise regression method that starts with a full model and iteratively removes the least significant variables to optimize model performance.
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