exam Maths Puzzle Numerical Ability

Solve log^a (7x+1)=log^a(4x+16)

How?

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exam Other Question

2x+3y=24
y+7x=46

Im stuck from the very begining... I am having difficulty solving this exercise:

Multiply -3a^2b/35^5 times 14a^3b^2/-9b^4. Thank you in advance for any help you can give me.