17 = -13 - 8x
First, add '13' to both of the sides.
 Second,
Second, add 17 + 13 to get 30.
 Third,
Third, divide both sides by '-8'.
 Fourth,
Fourth, change the fraction into a negative.
 Fifth,
Fifth, find the GCF of 30 and 8.
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
Factors of 8: 1, 2, 4, 8
The GCF is 2.
Sixth, divide the numerator by the GCF. 

 ÷ 
 Seventh,
Seventh, divide the denominator by the GCF. 

 ÷ 
 Eighth,
Eighth, combine your new numerator and denominator.
 Ninth,
Ninth, switch your sides.

Answer as fraction: 

Answer as decimal: -3.75