21? 84 over 4 is 21, so j=21... or is it a different statement? i did it as an equation; you might mean an inequality, as it says, but you don't say whether it is greater than or less than another value.
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b -8
Not enough information to answer the question.
you can use it
To solve the above inequality equation it has to have an equality sign so that i group all the the knowns and the unknowns.
not always,sometimes you have to solve for x