book Maths Puzzle Numerical Ability

-10x+3=-3x+12-4x

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I've been working on this one for hours and I couldn't get it. Can anyone help?
Find the zeros of the polynomial function and state the multiplicity.

3X^6 - 10X^5 - 29X^4 + 34X
I'M at a loss, please help! I don't think i'm doing it right and need to know how to get the right answer. the problem is:

To Earn a B ina course, you must have a final average