exam Maths Puzzle Numerical Ability

Please can you help me with this problem?

sqrt 30x-15 = x+7

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exam Other Question

Can someone please help me factor x(2x-y) + y(2x-y) Thanks! If we extablish an identity, sinAcscA-sin^2*A could equal which of the following quantities?
1. 1
2. cos^2*A
3. sin^2*A-1
4. tan^2*A