a, \(3,2x+\left(-1,2\right)x+2,7=-4,9\)
\(\Leftrightarrow3,2x-1.2x=-4,9-2,7\)
\(\Rightarrow2x=-7,6\)
\(\Rightarrow x=\dfrac{-7,6}{2}=-3,8\)
b, \(-5,6x+2,9x-3,86=-9,8\)
\(\Leftrightarrow-5,6x+2,9x=-9,8+3,86\)
\(\Rightarrow-2,7x=-5,94\)
\(\Rightarrow x=\dfrac{-5,94}{-2,7}=2,2\)
