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1.-63a^4b^3
2.10x-2x^2= 10x=2x^2, x cut , x=5
3.g^3h(gh-2), gh=2
4.42r^2+44r+10
21r^2+22r+5=0
7. a^2-y^2
5. (x+5)(x-7)(x+1)
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