$\text{a, 541 + (218 – x) = 735 }$
$\text{⇒ 218 - x = 735 - 541}$
$\text{⇒218 - x = 194 }$
          $\text{⇒x = 218-194}$
                  $⇒x=24$

$\text{b, 96 – 3(x + 1) = 42}$
$\text{⇒ 3 ( x + 1 ) = 96 - 42}$
$\text{⇒ 3 (x + 1 ) = 54 }$
$\text{⇒x + 1  = 54 : 3}$
$\text{⇒x + 1 = 18}$
$\text{x = 17}$

$\text{c, ( x – 47) – 115 = 0}$
$\text{⇒x - 47 = 115 }$
$\text{⇒x = 115 + 47}$
$\text{⇒x = 162 }$

$\text{d, (x – 36) : 18 = 12}$
$\text{⇒ x - 36 = 12 . 18}$
$\text{⇒ x - 36 = 216 }$
$\text{⇒ x = 216 + 36}$
$\text{⇒ x = 252}$

$\text{ e, 2x = 16 }$
$\text{⇒ x = 16 : 2}$
$\text{⇒x = 8}$

$\text{f , x50 = x}$
$\text{=> x = 0}$

Đáp án:

Giải thích các bước giải:

a) 541 + (218 – x) = 735

218 - x = 735 - 541

218 - x = 194

x = 218 - 194

x = 24

b) 96 – 3(x + 1) = 42

3(x + 1) = 96 - 42

3(x + 1) = 54

x + 1 = 54 : 3

x + 1 = 18

x = 18 - 1

x = 17

c) ( x – 47) – 115 = 0

x - 47 = 0 + 115

x - 47 = 115

x = 115 + 47

x = 162

d) (x – 36) : 18 = 12

x - 36 = 12 . 18

x - 36 = 216

x = 216 + 36

x = 252

e/ 2x = 16

x = 16 : 2

x = 8

f) x50 = x

50 = x . x

x² = 50

x = 25