sa se rezolve in R: a.[4-2x] ori [2x+4]=[1-2x] ori [2x+1]+5x+6 b.[5-2x] ori [2x+5]=[1-4x]ori[x+3]+3 c.[5-2x] ori [2x=5]=5-[x+2] ori [x-2] d.7x+3-[2x+3] ori [2x-3]=-[2x+1] la a doua            sa stiti ca suntparanteze rotunde