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2(9+k)=84
We simplify the equation to the form, which is simple to understand
2(9+k)=84
Reorder the terms in parentheses
+(+18+2k)=84
Remove unnecessary parentheses
+18+2k=+84
We move all terms containing k to the left and all other terms to the right.
+2k=+84-18
We simplify left and right side of the equation.
+2k=+66
We divide both sides of the equation by 2 to get k.
k=33
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