a, \(\Rightarrow10x-4+12-24x=12-4x-28\)
\(\Leftrightarrow-14x+8=-16-4x\Leftrightarrow-10x=-24\Leftrightarrow x=\dfrac{12}{5}\)
b, \(\left(x-7\right)\left(4x-1\right)+x\left(x-7\right)=0\)
\(\Leftrightarrow\left(x-7\right)\left(5x-1\right)=0\Leftrightarrow x=7;x=\dfrac{1}{5}\)
c, đk : x khác 4 ; -3
\(x^2-4x+2x+6=5\Leftrightarrow x^2+2x+1=0\Leftrightarrow\left(x+1\right)^2=0\Leftrightarrow x=-1\left(tm\right)\)
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