exam Maths Puzzle Numerical Ability

Solve. 5(x - 5) + 8x = 9x - 25

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exam Other Question

how do you know if 30 degree, 60 degree, 90 degree are a set of supplementary angles? Multiply:
(8√[6] + 3√[2])(4√[6] - 5√[2])

I believe FOIL is used here. I also think the answer should have no decimals.

Thanks for helping!!!