Răspuns :
[(a+23500+10000) - 12000] + 20000 = 50000 - 5000
a + 33500 - 12000 + 20000 = 45000
a + 41500 = 45000
a = 45000 - 41500
a = 3500
a + 33500 - 12000 + 20000 = 45000
a + 41500 = 45000
a = 45000 - 41500
a = 3500
a+23500+10000-12000+20000=50000-5000
a+33500-12000+20000=45000
a=45000-20000+12000-33500
a=25000+12000-33500
a=37000-33500
a=3500