Question 125635
IF YOU MEAN:
(5B+8)/3<3B THEN WE CROSS MULTIPLY.
5B+8<9B
5B-9B<-8
-4B<-8
B>-8/-4 [HERE WE HAVE TO CHANCE THE < SIGN TO A > SIGN BECAUSE WE DIVIDED BY A NEGATIVE NUMBER.
B>2
PROOF
LET B=2.1
(5*2.1+8)/3<3*2.1
(10.5+8)/3<6.3
18.5/3<6.3
6.167<6.3