exam Maths Puzzle Numerical Ability

On the substitution method after it says distribute the 5 it says divide each side by 17. Where did the 17 come from?

Also do you have the other substituion methods? All I know

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exam Other Question
Assume all varialbles represent positive numbers. sqrt(x^4y^3) (3-^3a-^2b^5 / c-^3d-^4) write with positive exponents