a, \(3x=12\Leftrightarrow x=4\)
b, \(\left(x-2\right)\left(x+2\right)-\left(x-2\right)\left(2x-5\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left(x+2-2x+5\right)=0\Leftrightarrow\left(x-2\right)\left(-x+7\right)=0\Leftrightarrow x=2;x=7\)
c, \(9x+6-3x-1=12x+10\Leftrightarrow6x=-5\Leftrightarrow x=-\dfrac{5}{6}\)
d, đk : x khác 3 ; x khác -1
\(x\left(x+1\right)+x\left(x-3\right)=4x\Leftrightarrow2x^2-2x-4x=0\)
\(\Leftrightarrow2x^2-6x=0\Leftrightarrow2x\left(x-3\right)=0\Leftrightarrow x=0\left(tm\right);x=3\left(ktm\right)\)
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