Question

Đề bài:tính 

(26-3x):5+71=75

Answer 1

`(26-3x):5+71=75`

`=> (26-3x):5=75-71`

`=> (26-3x):5=4`

`=> 26-3x=4.5`

`=> 26-3x=20`

`=> 3x=26-20`

`=> 3x=6`

`=> x=6:3`

`=> x=2`

Answer 2

\(26-3x=4.5\Leftrightarrow26-3x=20\Leftrightarrow x=2\)

Answer 3

\(\left(26-3x\right):5=75-71\\ \left(26-3x\right):5=4\\ 26-3x=20\\ 3x=26-20\\ 3x=6\\ x=6:3\\ x=2\)

Answer 4

(26-3x)÷5+71=75

=>(26-3×)÷ 5=75-71

=>(26-3x)÷5=4

=>26-3x=4×5

=>26-3x=20

=>3x=26-20

=>3x=6

=>x=6÷3

=>x=2

Vậy x=2