Question

-6(1+3k)= -20k

Explanation:

Step1: Expand left-hand side

$-6(1+3k) = -6 - 18k$
Equation becomes: $-6 - 18k = -20k$

Step2: Isolate k terms

Add $20k$ to both sides:
$-6 - 18k + 20k = -20k + 20k$
$-6 + 2k = 0$

Step3: Solve for k

Add 6 to both sides:
$2k = 6$
Divide by 2:
$k = \frac{6}{2}$

Answer:

$k = 3$