Help rearranging a formula

[carmine holly]

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[eager bear]

This is what i have so far but idk if they're right

[golden vortex]

Green-> shows them multiplied, however in red, you took them away.
As for the pink, you have y on both sides of the equation which isn’t valid

Try dividing instead of taking them away in part (i)
As for (ii) expand it to 3xy and then group the y’s together on one side and the non y’s on the other. I did find this quite difficult to get hang of it 4 years ago so i don’t blame you if you find this confusing

[eager bear]

This is what i got in the end although i had it done before I read what you said so idk if its right or not, im moving onto trigonometric equations now so if you could help, that would be amazing