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        The general solution of a linear equation    
    
            
                        
                
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        The general solution of a linear equation    
    
            
                        
                
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        Intersection points of linear formulas with the axes    
    
            
            
     
                                                                                    
    
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        Intersection points of linear formulas with the axes    
    
            
                        
                
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        Intersection point of two linear formulas    
    
            
                        
                
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        Intersection point of two linear formulas    
    
            
                        
                
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        THEORY    
    
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        11.
    
    
        General solution of a linear inequality    
    
            
                        
                
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        12.
    
    
        General solution of a linear inequality    
    
            
                        
                
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