{45363-[536+9X43-(2b+48-10)]}-1936:4x78=7608
{45363-[536+387-(2b+38)]}-484x78=7608
{45363-[923-(2b+38)]}-37752=7608
{45363-[923-(2b+38)]}=37752+7608
{45363-[923-(2b+38)]}=45360
[923-(2b+38)]=45363-45360
923-2b+38=3
2b+38=923-3
2b+38=920
2b=920-38
2b=882
b=882:2
b=441