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6+2\times 3-12+2k\left(3\times 3-\frac{2\times 3}{2}-6\right)=0
Multiply both sides of the equation by 2.
6+6-12+2k\left(3\times 3-\frac{2\times 3}{2}-6\right)=0
Multiply 2 and 3 to get 6.
12-12+2k\left(3\times 3-\frac{2\times 3}{2}-6\right)=0
Add 6 and 6 to get 12.
2k\left(3\times 3-\frac{2\times 3}{2}-6\right)=0
Subtract 12 from 12 to get 0.
2k\left(9-\frac{2\times 3}{2}-6\right)=0
Multiply 3 and 3 to get 9.
2k\left(9-3-6\right)=0
Cancel out 2 and 2.
2k\left(6-6\right)=0
Subtract 3 from 9 to get 6.
2k\times 0=0
Subtract 6 from 6 to get 0.
0k=0
Multiply 2 and 0 to get 0.
0=0
Anything times zero gives zero.
\text{true}
Compare 0 and 0.
k\in \mathrm{R}
This is true for any k.