exercitiul 5 va rog !!!

a) x(5/2)=15/4, numitor comun 4, 2x*5=15, 10x=15, x=15/10=3/2
b) (x-1)/3=5, x-1=15, x=16
c) 2x+3/2=8/5, numitor comun 10, 20x+15=16, 20x=1, x=1/20