exam Maths Puzzle Numerical Ability

How would u solve the equation 2a-6=-a??

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exam Other Question

Multiply the following:

-3a^b/35a^5 multiplied by 14a^3b^/-9b^4

Any help would be greatly appreciated.
How to Simply Square Roots;



1. 25/64
2. 36
3. 3*6
4. 50/10
5. 12/9
6. 64
7. 40
8. 99
9. 196
10. 32
11. 90
12. 324
13. 24
14. 84