Answer:
x - 7
Step-by-step explanation:
Because Julian is 7 inches shorter than his sister, and his sister's height is x, if we subtract 7 from x, we get Julian's height, x - 7.
Julian's height is equal to x-7
If we knew what his sister's height was, we would subtract 7 from that so we replace what we don't know with x and subtract 7.
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