Ok,
The total is 64$:
= 64
It shows us one of the numbers for the equation, 13
+ 12 = 63
Two passes together plus the thirteen equals the total of 63$
the price of the pass is unknown, so we can use a variable to figure it out:
2x + 12 = 64
Now we solve
First subtract 12 from both sides:
2x + 12 - 12 = 64 - 12
Then divide both sides by 2:
2x ÷ 2 = 52 ÷ 2
And now we have our answer:
x = 26