q - 9q = -8q
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no, combining like terms means combine the terms that are the same 15+x+6+x=28 combine like terms 21+2x=28 2x=7 x=3.5
You combine like terms.
456
i think yes, because you can combine 2 and -2, which are like terms, so why not 2a and -2a?
3x + x = 4x