21:(х-7)=7 помогите пжлст

Question

21:(х-7)=7 помогите пжлст

Answer 1

21:(х-7)=7
21:7=х-7
х=21:7+7
х=10
21:(10-7)=7
            7=7

Answer 2

21:(x-7)=7 x-7=21:7 x-7=3 x=7+3 x=10