Question 1173464
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Hi
 Miranda is 8 years older than her brother(x). The sum of their age is 22.
Let x be the brother's age
Write as You read
(x + 8) + x = 22
2x = 14
x = 7, the brother's age.  Miranda is 15 {{{7+8}}} 
and 
15 + 7 = 22  checks!
  Wish You the Best in your Studies.