Question 1175435
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Hi
12mi from A to B
walked 'x' miles
remaining is 'y' miles
 y = 12-x
and 
x + 12-x = 12
For ex: IF x = 5mi ⇒ y = 12-x = 7
Using the variable like x and y helps one solve problems!
Wish You the Best in your Studies.
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