exam Maths Puzzle Numerical Ability

x+3y=4y-8

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Can someone please help me to understand these. Its been a long time for me in high school.



c. Simplify: (-4 + x2 + 2x3) – (-6 – x + 3x3) – (-6y3 + y2)
d. Add: (2x2 + 6y2
Find the Greatest Common Factor of the numbers or monomials.

11. 23x^2,6x

Any help with this equation would be greatly appreciated:)