Simplify $-2(-3x-4)+5$. Answer ...

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1. 1Factorise completely $9b^{2} - 6ab + a^{2} - x^{2}$. Simplify $\dfrac{5}{2x^{2} - 7x - 4} - \dfrac{8}{4 - x}$.
2. 2设$(5a+3b)^{2}=(5a-3b)^{2}+A$，则$A=()$ A. $30ab$ B. $60ab$ C. $15ab$ D. $12ab$
3. 3解方程：$14％x-9％(x+10)=7％x+0.2$
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