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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in need of help with solving this system: {x^2-100y^2=100
{x^2+ y^2=100
thanks for the help. How can I use this real life situation in a grpah using my checking account and balancing it out every week to see my expenses. how much was spend, how much I need to keep till n