4 - 9 = -5
One the number line .
... -6,-5,-4,-3,-2,-1,0,1,2,3,4,5,....
On the number line , star at '4' and move '9' places (subtraction) to the left, you end up on '-5'.
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4 is 5 less than 9
9
s=35 or less
x can be any number greater than 16 and less than 81.
all factors of 4 and all factors of 9 ex: 4, 9, 36, 72...etc