exam Maths Puzzle Numerical Ability

9q/10 - 3/5q = 3/4 - 1/8

Can someone tell me the steps to solve this?

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exam Other Question

I have been stuck on solving this equation

8x-11x+13x=40-16x+6x The amount of ozone in the atmosphere is decreasing by 0.25%annually. If this rate of decrease continues, after how many years will 82.9% of today's ozone remain?