book Maths Puzzle Numerical Ability

I have been out of school for a long time and am studying for a test to get a job. I have forgotten how to solve algebraic equations! I never was very good at it anyway. I am havin

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book Other Question

The demand and supply equations for a certain item are given by
D=-5p+40
S=-p^2+30p-8
Find the equilibrium price.

Please help. Thank you.
y/10 =-2/5