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What do you think the answer is?

that would mean there are 30 3x's and 10 -1's ?

in other words
10(3x -1) is 30x + -10 which can be written 30x-10

the answer to this problem is
mistake was to not multiply both terms by the "factor"

ohh so they did not properly distibute the whole problem?

yes, they did
10(3x-1) --> 10*3x -1
which means they did not do 10*-1

I know, that is what I meant, I just did not know how to word it xD

Thank you Phi ! you really helped me !

you said it ok

okay! thank you for such a thorough explanation and not just giving out answers!