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0=9(7+k)+(6k+3)2
We simplify the equation to the form, which is simple to understand
0=9(7+k)+(6k+3)2
Reorder the terms in parentheses
0=+(+63+9k)+(6k+3)*2
Remove unnecessary parentheses
0=+63+9k+(+6k+3+)+*2
Reorder the terms in parentheses
0=+63+9k+(+12k+6)
Remove unnecessary parentheses
0=+63+9k+12k+6
We move all terms containing k to the left and all other terms to the right.
-9k-12k=+63+6-0
We simplify left and right side of the equation.
-21k=+69
We divide both sides of the equation by -21 to get k.
k=-3.2857142857143
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