a, 6x-5=-7-13
6x-5=-20
6x=-15
x=\(\frac{-15}{6}\)
b, /x/-20=-3
/x/=17
\(\Rightarrow\orbr{\begin{cases}x=17\\x=-17\end{cases}}\)
c,/x+9/.4-2=18
/x+9/.4=20
/x+9/=5
\(\Rightarrow\orbr{\begin{cases}x+9=5\\x+9=-5\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=-4\\x=-14\end{cases}}\)
d, 8x+24=6(x-14)
8x+24=6x-84
8x-6x=-84-24
2x=-108
x=-54
e, 10x-(-19)=39
10x+19=39
10x=39-19
10x=20
x=2
g, (x+2016)(x-2017)=0
\(\orbr{\begin{cases}x+2016=0\\x-2017=0\end{cases}}\)=>\(\Rightarrow\orbr{\begin{cases}x=-2016\\x=2017\end{cases}}\)