linear equations

2a-(8a+1)-(a+2)*5=9

Sorry I forgot the 5 and an a (Thank you Alan!)

$2a-(8a+1)-(a+2)\times5=9$

$2a-8a-1-5a-10=9$

$-11a=9+10+1-2$

$-11a=18$

${\color{blue}a=-\frac{18}{11}}$       !

${\color{blue}a=-1\frac{7}{11}}$      !

2a-(8a+1)-(a+2)*5=9

$2a-(8a+1)-(a+2)=9$

$2-8a-1-a-2=9$

$-9a=9+2+1-2$

$-9a=10$

${\color{blue}a=-\frac{10}{9}}$       !

${\color{blue}a=-1\frac{1}{9}}$      !

2a-(8a+1)-(a+2)*5=9

Thank you Alan! I will be more exact in the future!

$2a-(8a+1)-(a+2)\times5=9$

$2a-8a-1-5a-10=9$

$-11a=9+10+1$

$-11a=20$

${\color{blue}a=-\frac{20}{11}}$       !

${\color{blue}a=-1\frac{9}{11}}$      asinus :- )  !