2k-3k=-2(k+6)-2(k+3)

Solution for 2k-3k=-2(k+6)-2(k+3) equation:

2k-3k=-2(k+6)-2(k+3)

We simplify the equation to the form, which is simple to understand 
2k-3k=-2(k+6)-2(k+3)

Reorder the terms in parentheses
2k-3k=+(-2k-12)-2*(k+3)

Remove unnecessary parentheses
+2k-3k=-2k-12-2+*(+k+3+)

Reorder the terms in parentheses
2k-3k=-2k-12+(-2k-6)

Remove unnecessary parentheses
+2k-3k=-2k-12-2k-6

We move all terms containing k to the left and all other terms to the right. 
+2k-3k+2k+2k=-12-6

We simplify left and right side of the equation. 
+3k=-18

We divide both sides of the equation by 3 to get k. 
k=-6