Estimate 5171 / 17 by first rounding each number so that it has only 1 nonzero digit.
2 answers:
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Rewrite -1 as a fraction
Cross multiply
Distribute the -1
Add both sides by ax
Subtract both sides by 3
Divide both sides by 3a
Simplify
That's the value of x respect to a. Let me know if you need any clarifications, thanks!