Question 343742
{{{a < b}}} Start with the given inequality.



{{{a-b < cross(b-b)}}} Subtract b from both sides.



{{{a-b < 0}}} Simplify



{{{cross(a-a)-b < 0-a}}} Subtract 'a' from both sides.



{{{-b < -a}}} Simplify



{{{-a>-b}}} Flip the inequality (this is possible since {{{x>y}}} is the same as {{{y<x}}} and vice versa)



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