C \( A+\frac{1}{2} B+\frac{1}{2} C=4 \) (2) \( -B B=-2 \) (3) \( -A=1 \)

3) \( Y+\left[\begin{array}{l}-1 \\ -6\end{array}\right]=\left[\begin{array}{c}10 \\ -14\end{array}\right] \)

Question 3 A store is selling a large selection of men's shirts, and every shirt has the same price. Kiyoshi buys 6 shirts and gets a \( \$ 30 \) discount. His friend Gregory buys 4 shirts and does not receive a discount. Gregory spends \( \$ 20 \) less than Kiyoshi. What is the price of one shirt without any discount? \( \$ 25 \) \$ \( \$ 5 \) \$ \( \$ 100 \) \( \$ 80 \)

5) \( 4(2-x)=x+3 \)

6) \( \frac{1}{x-2}=2 \)

e) \( (3 x+2) \cdot\left(x^{3}-2 x^{2}+1\right)= \)