Question 709117


{{{21>15+2a}}} Start with the given inequality.



{{{0>15+2a-21}}} Subtract {{{21}}} from both sides.



{{{-2a>15-21}}} Subtract {{{2a}}} from both sides.



{{{-2a>-6}}} Combine like terms on the right side.



{{{a<(-6)/(-2)}}} Divide both sides by {{{-2}}} to isolate {{{a}}}. note: Remember, the inequality sign flips when we divide both sides by a negative number. 



{{{a<3}}} Reduce.



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Answer:


So the solution is {{{a<3}}}