Răspuns :
desfaci parantezele apoi treci b intro parte si celelalte peste egal
812:4-2X[7X8-2X(b+3)-8]X3=101-90 812::4-2X(56-2b+6-8)X3=11 203-2X(54-2b)X3=11 2X(54-2b)X3=203-11 2X(54-2b)X3=192 (54-2b)X3=192:2 (54-2b)X3=96 54-2b=96:3 54-2b=32 2b=54-32 2b=22 b=22:2 b=11