exam Maths Puzzle Numerical Ability

hey i need help how do u do this problem can u plz help plz this problem
6-b=5b+30 and other can u plz show me how to do this

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exam Other Question
Simplify: [(27^-2x)(25^x)^4(3^6x)^1/2]/ 9^x(625^(x-1))^-2 Multiply.
8pq^2(2pq - 3p + 5q)