đk : x khác -1 ; 1
\(\Rightarrow16-2\left(x+3\right)\left(x+1\right)=5\left(x-1\right)\)
\(\Leftrightarrow16-2\left(x^2+4x+3\right)=5x-5\Leftrightarrow-2x^2-8x+10=5x-5\)
\(\Leftrightarrow-2x^2-13x+15=0\Leftrightarrow-2x^2-15x+2x+15=0\)
\(\Leftrightarrow-2x\left(x-1\right)-15\left(x-1\right)=0\Leftrightarrow\left(-2x-15\right)\left(x-1\right)=0\Leftrightarrow x=-\dfrac{15}{2};x=1\)
Kết hợp đk vậy x = -15/2
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