ПОМОГИТЕ ПОЖАЛУЙСТА))))) 3) 7(3х - 1) = -4х + 23; 4) 3(3х - 1) + 5 = 8(х + 2) + 3; 5)...

Question

ПОМОГИТЕ ПОЖАЛУЙСТА)))))
3) 7(3х - 1) = -4х + 23;
4) 3(3х - 1) + 5 = 8(х + 2) + 3;
5) -4,5(х + 3) - 1 = 7,2 - 5(х — 2);

Answer 1

3)  7 * (3х - 1) = - 4 + 23                     4)    3 * (3х - 1) + 5 = 8 * (х + 2) + 3

    21х - 7 = - 4 + 23                              9х - 3 + 5 = 8х + 16 + 3

    21х = - 4 + 23 + 7                             9х - 8х = 16 + 3 + 3 - 5

    21х = 26                                            х = 17  

    х = 26 : 21 

    х = 26/21 = 1 5/21             

                                                              5) - 4,5 * (х + 3) - 1 = 7,2 - 5 * (х - 2)

                                                              - 4,5х - 13,5 - 1 = 7,2 - 5х + 10

                                                              - 4,5х + 5х = 7,2 + 10 + 13,5 +1

                                                               0,5х = 31,7

                                                               х = 31,7 : 0,5

                                                               х = 63,4