a. 2x+5x=35                        b.-7+x=4.(-3)^2                       c. 2(x+1)^3=2020^0            

       7x    =35                           -7+x=4.-9                                 2(x-10)^3=1

          x=35:7                             -7+x=36                                    (x-10)^3=2:1

           x=5                                        x=36-(-7)                            (x-10)^3=2

                                                          x=43                                   (x) ^3     =2+10

                                                                                                      (x) ^3     =12

                                                                                                       x             =12^3=1728

Giải thích các bước giải:

 a) $2x+5x=-35$

$\to 7x=-35$

$\to x=-5$

b) $-7x+x=4.(-3)^2$

$\to -6x = 36$

$\to x=-6$

c) $3.5^x -35 = 5.2^3$

$\to 3.5^x = 40 + 35$

$\to 3.5^x = 75$

$\to 5^x = 25$

$\to x=2$

d) $(2x+1)^3 = 2020^0 =1$

$\to 2x+1=1$

$\to 2x=0$

$\to x=0$

e) $5.3^x - 35 = 4.5^2$

$\to 5.3^x = 100  + 35$

$\to 3^x = 135 : 5 = 27$

$\to x=3$