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-7(1-k)+7(2k+1)=0
We simplify the equation to the form, which is simple to understand
-7(1-k)+7(2k+1)=0
Reorder the terms in parentheses
+(-7+7k)+7*(2k+1)=0
Remove unnecessary parentheses
-7+7k+7+*(+2k+1+)=0
Reorder the terms in parentheses
-7+7k+(+14k+7)=0
Remove unnecessary parentheses
-7+7k+14k+7=0
We move all terms containing k to the left and all other terms to the right.
+7k+14k=0+7-7
We simplify left and right side of the equation.
+21k=0
We divide both sides of the equation by 21 to get k.
k=0
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