opening brackets
5×k -5×2- 8k=-34
multiplying
; 5k- 10 - 8k= -34
collecting like terms(6a and 7a is an example of like terms)
here the like terms are 5k and 8k because both numbers have a common variable k.
collect like terms
; 5k - 8k =-34 + 10 (be mindful of the signs, if a negative sign crosses the equality sign it becomes positive)
: -3k = -24
since we are looking on the variable k, divide both expressions by the numerical accompanying k I.e -3(note the sign)
-3k/-3=-24/-3(- cancels out - and 3 cancels out 3 in the first expression leaving k, then 3 divides 24 in the second expression giving 8)
k=8