1. 8x - 4 = -2x + 1
2. 6x + 3 = 6 - 3


3. 0x = 0


4. 6/7 x 4/14


5. 5/3 + 3/6


6. (1/3)² x (1/3) ⁻⁶


7. 2x + 7y