1. Solve for x:
   2x + 5 = 13
2. Simplify:
   3x + 4x – 2
3. Solve:
   x – 7 = 10

1. Solve for x:
   3(x + 2) = 18
2. Factor:
   x^2 + 5x + 6
3. Solve:
   2x – 3 = x + 5

1. Solve the system of equations:
   2x + y = 7
   x – y = 1
2. Solve for x:
   x^2 – 9 = 0
3. Simplify:
   frac{2x^2 + 4x}{2x}