you just subtract normally and keep the same sign
4-2=2
(-4)-(-2)=(-2)
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You can only add or subtract like terms. So, you subtract 9x from 2x, which gives you -7x. Then subtract -9 from 3 to get -6. And you are left with -7x -6.
15
Subtract the absolute value of the smaller number from the absolute value of the larger number. The answer will have the sign of the larger numbers.
The same way you would add or subtract whole numbers, leaving the denominators alone.
wich one