\(a,Đkxđ:x\ne2\\ \Leftrightarrow1.3\left(x-2\right)+x-3=0\\ \Leftrightarrow4x-8=0\\ \Leftrightarrow4x=8\\ \Leftrightarrow x=2\left(ktm\right)\\ c,đk:x\ne\pm1\\ \Leftrightarrow\left(x+1\right)^2-\left(x+1\right)^2=4\\ \Leftrightarrow x^2+2x+1+2x+1-1=0\\ \Leftrightarrow4x=4\Rightarrow x=1\left(loại\right)\)
\(b,Đk:x\ne-3\\ \Leftrightarrow7.2x\left(x+3\right)-7.2x^2=7.4x+2\left(x+3\right)=0\\ \Leftrightarrow14x^2+42x-14x^2=18x+2x+6\\ \Leftrightarrow12x=6\\ \Leftrightarrow x=\dfrac{1}{2}\left(tm\right)\\ d,\dfrac{Đk}{x}\ne-7;x\ne\dfrac{3}{2}\\ \Leftrightarrow\left(3x-2\right)\left(2x-3\right)=\left(6x+1\right)\left(x+7\right)\\ \Leftrightarrow6x^2-9x-4x+6=6x^2+42x+x+7\\ \Leftrightarrow-56x=1\\ \Leftrightarrow x=\dfrac{-1}{56}\left(tm\right)\)
