-2m + 15, m = 4
now i got positive 7, is it correct?
                                             
                                          
                                          
                                        
											 
											Step-by-step explanation:
[tex] = ( - 2m) + 15 \\ = ( - 2 \times 4) + 15 \\ = - 8 + 15 \\ = 7[/tex]