Solve 3x^2 + 4x = 4:

3x^2 + 4x - 4 = 0

Using the quadratic formula:
x = (-4 ± sqrt(4^2 - 43(-4)) / (2*3)
x = (-4 ± sqrt(16 + 48)) / 6
x = (-4 ± sqrt(64)) / 6
x = (-4 ± 8) / 6

Therefore, x = (-4 + 8) / 6 or x = (-4 - 8) / 6
x = 4/6 or x = -12/6
x = 2/3 or x = -2

Solve 3x - 1/x + 2 - 7/2 + x = 7x^2 - 28/x^2 - 4 + 18/2 - x:

This equation involves complex fractions and it would be best to simplify it before attempting to solve for x. Simplify the equation first, and then solve for x.