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7)frac{9a(a+1)}{5(a+1)}=frac{9a}{5}\\Otvet:boxed{frac{9a}{5}}\\8)frac{6x+3y}{4x^{2}+4xy+y^{2}}=frac{3(2x+y)}{(2x+y)^{2}}=frac{3}{2x+y}\\Otvet:boxed{frac{3}{2x+y}}

9)frac{a-b}{b-a}=-frac{a-b}{a-b}=-1\\Otvet:boxed{-1}\\10)frac{m^{3}-n^{3}}{m^{2}-n^{2}}=frac{(m-n)(m^{2}+mn+n^{2})}{(m-n)(m+n)}=frac{m^{2}+mn+n^{2}}{m+n}\\Otvet:boxed{frac{m^{2}+mn+n^{2}}{m+n}}

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