Răspuns:
a 3x-12=2x
3x-2x=12
x=12
S={12}
b x×x-9x+20=0
x×x-9x=-20
x(x-9)=-20
x-9=-20÷x
x×x=-20+9
x×x=-11
c 2x+3=5
2x=5-3
2x=2
x=1
d 2x-5<11
Nu stiu
e x-1/2=3
x-1=2×3
x-1=6
x=7
sper ca te ajut
