exam Maths Puzzle Numerical Ability

Can I have some help finding the inverse function of f.

f(x) = -8x - 7

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exam Other Question

log3(3x+73)=74 a trader bought a number of articles for Rs.1200.ten were damaged and he sold each of the rest at Rs.20 more than what he paid for it, thus clearing a profit of Rs.60 on the whole