Răspuns :
a×3+18:6-4×5+2×10=33
b+3-20+20=33
c-20+20=33
d+20=33
d=33-20
d=13
c-20=13
c=20+13
c=33
b+3=33
b=33-3
b=30
ax3=30
a=30:3
a=10
b+3-20+20=33
c-20+20=33
d+20=33
d=33-20
d=13
c-20=13
c=20+13
c=33
b+3=33
b=33-3
b=30
ax3=30
a=30:3
a=10