first thing's first, distribute -3 and -8 to the parentheses beside them, after distributing we get
-18k+12 = -32-40k
Now let us isolate all the coefficients with 'k' beside it:
-18k+12 = -32-40k (add 40k on both sides to cancel it on the left of the equals sign and to add it to the right of the equals sign)
40k-18k+12 = -32 -40k +40k
40k-18k+12 = -32
40k-18k+12-12=-32-12(subtract 12 on both sides to cancel it on the right of the
equals sign and to add it to the right of the equals sign)
40k-18k = -32-12
Add the like terms
22k = -44
isolate the k, so divide 22 to both sides
(22k/22) = (-44/22)
k = -2
