a) x+(4/9-1/9)=1
calculam fractiile din paranteze 4/9-1/9=(4-1)/9=3/9 =1/3
inlocuim x+1/3=1
3x/3+1/3=1
(3x+1)/3=1 inmultim cu 3 si avem:
3(3x+1)/3=3
3x+1=3
3x=3-1
3x=2
x=2/3
b)x-(5/8+6/8-3/8)=4/5+1/5
calculam fractiile 5/8+6/8-3/8=(5+6-3)/8=8/8=1
4/5+1/5=(4+1)/5=5/5=1
inlocuim x-1=1
x=1+1
x=2