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50
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1. ....

 Nov 4, 2019
edited by tomsun  Nov 8, 2019
 #1
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+1

1. 13

2. a=-1/7

 Nov 4, 2019
 #2
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+2

1 - See full answer here:  https://web2.0calc.com/questions/need-help_98

 Nov 4, 2019

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