book Maths Puzzle Numerical Ability

x = (3x-5)
2 4

I have tried every thing and cant figure it out please help

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book Other Question

If you're the frugal type and never pay more for something than it's worth, would you pay $0.50 for a cup of coffee valued at i^i (that's i to the i power)? please help me solve and graph this function 3x^2+2x-6