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Bài 1 :
a, \(12-2x-2=3x-5\Leftrightarrow-5x=-15\Leftrightarrow x=3\)
b, \(\dfrac{6}{7}x+\dfrac{2}{7}=2+\dfrac{6}{7}x\)( vô lí ) -> pt vô nghiệm
c, \(x^2-x=x^2-4\Leftrightarrow x=4\)
d, đk : x khác 1
\(\Rightarrow x^2+x+1-3x^2=2x^2-2x\Leftrightarrow-4x^2+3x+1=0\)
\(\Leftrightarrow\left(x-1\right)\left(-4x-1\right)=0\Leftrightarrow x=1\left(ktm\right);x=-\dfrac{1}{4}\)
e, \(\Rightarrow30x+9=36+24+32x\Leftrightarrow-2x=51\Leftrightarrow x=-\dfrac{51}{2}\)
f, \(\Rightarrow9x+6-3x-1=10+12x\Leftrightarrow-6x=5\Leftrightarrow x=-\dfrac{5}{6}\)