exam Maths Puzzle Numerical Ability

simplify7to2nd=8to3rd-8to2nd

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Help me please, I have tried to understand how to do this one..

Write the expression in simplest form.

ab - 3a + 5b - 15/15 + 3a^2 - 5b - a^2b

Thank you
x<2
Y<2/3X-1