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\[x{3} + 8 x{3}\]

\[x^3+8x^3=x^3(1+8)=9x^3\]

Cool! Here's the next one...\[15x{7}-13x{7}\]

Could you do the same exact thing for this one?

x^7(15-13)=2x^7

@HorseCrazyGirlForever ok

\[2x{7}\]

( x^5) (3x^5)

yaa

What is the answer?

x^5*3x^5
3x^5

Cool! Here's the next one........

(3x^8) divided by ( x^5 )

x^5(3x^3)
3x^8

thnx @myininaya

I don't really understand...

which one?

The ones I just posted.......

Hope I helped you :)