No. You can't subtract unlike terms
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Unlike terms.
The denominators need to be the same for subtraction. Find the Least Common Denominator for both items and then subtract.
A trinomial is a polynomial. All trinomials are polynomials but the opposite is not true. a trinomial= three unlike terms. a polynomial= "many" unlike terms.
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.
Decreased means subtract. If your age is decreased by 5, that means take your age and subtract 5.