Помогите 7(х-9)-(3х+1)=9

Question

Помогите 7(х-9)-(3х+1)=9

Answer 1

7х-63-3х-1=9
4х-64=9
4х=73
х=18.25

Answer 2

7(х- 9) -( 3х +1)=9
7х -63 -3х -1=9
4х-64=9
4х=9+64
4х=73
х=73:4
х=18,25