a + b = 49
a - b = 9
Add both together to get
(a+a)+(b-b) = 58
2a=58
a = 29 ◄
plug that into the second equation to get
29 - b = 9
so b = 20 ◄
Check:
29 + 20 = 49
29 - 20 = 9
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