book Maths Puzzle Numerical Ability

Name the properties used in each step.
1. =3C+5C+5(2)

2. =(3C+5C)+5(2)

3. =(3+5)C+5(2)

4. =8C+10

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book Other Question

Can you please help me with these few problems? Thank you very much for your timeand help!

{{{x=2y-4=0}}}
{{{6x-5y+20=0}}}
{{{-2x=2y+5}}}
Looking for some help. Solve the following radical equation

x=1+6 sqrt x-9

thank you for your time