Explicație pas cu pas:
5/10+4/10-(a+3)/10=1/10
9/10-(a+3)/10=1/10
-(a+3)/10=-8/10
(a+3)/10=8/10
A+3=8
A=5
Răspuns:
5/10 + 4/10 - ( a+3)/10 = 1/10
9/10 - (a+3)/10 = 1/10
(a+3)/10 = 9/10 - 1/10
a/10 = 8/10 - 3/10
a/10 = 5/10
a = 5
