=|a+7|+|a-15|= a+7 -a +15=22
a+7≥0⇒ |a+7|=a+7
a-15≤0⇒|a-15|=15-a
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=|a+7|+|a-15|= a+7 -a +15=22
a+7≥0⇒ |a+7|=a+7
a-15≤0⇒|a-15|=15-a