Question

Tìm x:

(x-27):8=30

7.(x-6)=4x+9

 

Answer 1

\(\left(x-27\right):8=30\)

\(\Rightarrow x-27=30\cdot8\)

\(\Rightarrow x-27=240\)

\(\Rightarrow x=240+27\)

\(\Rightarrow x=267\)

______________

\(7\left(x-6\right)=4x+9\)

\(\Rightarrow7x-42=4x+9\)

\(\Rightarrow7x-4x=9+42\)

\(\Rightarrow3x=51\)

\(\Rightarrow x=51:3\)

\(\Rightarrow x=17\)

Answer 2

a: =>x-27=30*8=240

=>x=240+27=267

b: =>7x-42=4x+9

=>7x-4x=9+42

=>3x=51

=>x=17