Răspuns:
A) x/2=25/5
x=2*25/5=50/5=10
B) 2x/17=4/5
2x=17*4/5=68/5=13,6
x=13,6:2
x=6,8
C) 2/5=4/3x+1
3x+1=5*4/2=10
3x=10-1=9
x=9:3
x=3
Sper ca te-am ajutat!