a) 3636:(12x-91) =36

12x-91 = 3636:36

12x-91=101

12x=101+91

12x=192

x=192:12

x=16

b) (x : 23+45).67=8911

(x : 23+45)=8911:67

(x : 23+45)=133

x:23=133-45

x:23=88

x=88.23

x=2024

c) 420+65.4 =(x+175):5+30

420+260=(x+175):5+30

680=(x+175):5+30

(x+175):5=680-30

(x+175):5=650

(x+175)=650x5

(x+175)=3250

x=3250-175

x=3075

d) (32.15):2=(x+70):14-10

480:2=(x+70):14-10

240=(x+70):14-10

(x+70):14=240+10

(x+70):14=250

(x+70)=250.14

(x+70)=3500

x=3500-70

x=3430

e)x-4867=(175.2-50.70):25+23

x-4867=(350-3500):25+23

x-4867=-3150:25+23

x-4867=-126+23

x-4867=-103

x=-103+4867

x=4764

Có:  \(35x+15=890\Rightarrow35x=875\Rightarrow x=25\)

x-4867=(175.2050.70):25+23

x-4867=25112500:25+23

x-4867=1004500+23

x-4867=104523

    x    =104523+4867

    x    =1009390

x-4867=(175.2050.70):25+23

x-4867=25112500:25+23

x-4867=1004500+23

x-4867=1004523

x=1004523+4867

x=1009390

Vậy x=1009390

a﴿ x ‐ 4867 = 2050.70. ﴾175: 25﴿ + 23 x ‐ 4867

= 2050.70.7 + 23 = 1004 500

=> x = 1 004 500 + 4867 = 1 009 367

X - 4867 = 25112500 : 25  + 23

X - 4867 = 1004500 + 23

X - 4867 = 1004523 

       X = 1004523 + 4867 

       X = 1009390

x-4867=0:25+23

x-4867=0+23

x-4867=23

x        =4867+23

x        =4890

x- 4867=[175 x 2 - 50 x 7] :25 +23

x - 4876 = (350 - 350)  : 25 + 23

x - 4876 = 0

x = 0 + 4876

x = 4876