\(3,2x+\left(-1,2\right)x+2,7=-4,9\)
\(\Rightarrow x.\left[3,2+\left(-1,2\right)\right]=-4,9-2,7\)
\(\Rightarrow x.2=-7,6\)
\(\Rightarrow x=-7,6:2=-3,8\)
Vậy=.
b. \(-5,6.x+2,9.x-3,86=-9,8\)
\(\Rightarrow-2,7.x=-9,8+3,86\)
\(\Rightarrow-2,7.x=-5,94\)
\(\Rightarrow x=-5,94:\left(-2,7\right)=2,2\)
Vậy=-