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Aflati termenul necunoscut
7/5 - (8/5 - x)=2/5
8/3+4/3 - (x+3/3)=8/3
2/5+(2/5+(2/5-x))-1/5=3/5


Răspuns :

7/5-(8/5-x) = 2/5
8/5-x=7/5-2/5
8/5-x=5./5
x=8/5-5/5=3/5

8/3+4/3-(x+3/3)=8/3
x+3/3=8/3+4/3-8/3
x+3/3=4/3
x=4/3-3/3=1/3



7/5 - 8/5 + x=2,5
-1/5x = 2,5 =》
x= 2,5 : (-1/5)
x= 5/2 : -1/5
x = -1/2 = -0,5