if keyboard_check(vk_left) {  
     if place_free(x - 4, y) {  
        x -= 4;  
     } else {  
         n = instance_place(x - 1, y, objBox);
         with n {  
             if place_free(x - 4, y) {  
                 x -= 4;  
                 other.x -= 4;  
             }  
         }  
     }  
}