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-21-8k=-3(4k+6)+k
We simplify the equation to the form, which is simple to understand
-21-8k=-3(4k+6)+k
Reorder the terms in parentheses
-21-8k=+(-12k-18)+k
Remove unnecessary parentheses
-21-8k=-12k-18+k
We move all terms containing k to the left and all other terms to the right.
-8k+12k-1k=-18+21
We simplify left and right side of the equation.
+3k=+3
We divide both sides of the equation by 3 to get k.
k=1
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