Răspuns:
a/---/-+26--/
b/---/ acolada 84
84-26=58(b×2)
b=58÷2
b=29
a=29+26
a=55
a + b = 84
a - b = 26
a = 26 + b
26 + b + b = 84
26 + 2 × b = 84
2 × b = 84 - 26
2 × b = 58
b = 58 : 2
b = 29
a = 26 + 29
a = 55
