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Hi i'm mr chad, and im going to solve this expression today
10x - 30 ;x= -1
the first thing we need to do is substitute the -1 to any variable
10(-1) - 30
next we change the subtraction into adding the opposite.
next we multipy 10 and 1 which is 10
now we have to check for exponents their are no exponents in this expression so nothing changes
now we do the order of operations, the first thing we do is look for what's in the parenthesis, but theirs only -1 so we can't do anything yet
next we subtract 10 from 30 and get 20
20 is the answer to the Expression!