Question

a)     (7x – 15).8 – 21 = 27

Answer 1

a: =>(7x-15)x8=48

=>7x-15=6

=>7x=21

hay x=3

Answer 2

\(\left(7x-15\right)8=27+21\\ \left(7x-15\right)8=48\\ 7x-15=48:8\\ 7x-15=6\\ 7x=6+15\\ 7x=21\\ x=21:7\\ x=3\)

Answer 3

\(\left(7x-15\right).8-21=27\\ \Rightarrow\left(7x-15\right).8=48\\ \Rightarrow7x-15=6\\ \Rightarrow7x=21\\ \Rightarrow x=3\)

Answer 4

(7x−15).8−21=27

⇒(7x−15).8=48

⇒7x−15=6

⇒7x=21

⇒x=3

Answer 5

x = 3