exam Maths Puzzle Numerical Ability

Write this expression in simplest form.

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

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exam Other Question

Hello Again!
Can someone help me solve this problem?
/2x-1-x=-2
(/ is the radical sign) the radical sign is only over 2x-1
Thanks in advance for your help!
ac (3m^2n^4 OVER 2mn^3)^3