помогите пожалуйста с уроывнением и с задачей это очень срочно заранее спасибо

13.95+3.1x=28.52                                                                                                              3.1x=28.52-13.95                                                                                                                3.1x=14.57                                                                                                                         x=14.57/3.1                                                                                                                          x=4.7