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Anonymous
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It is the same as: 9a -4a = 5a
A+5=-5a+5 A=-5a+5-5 (bring one of the 5 over)(not necessary) A=-5a (if big and small letters are the same, A=a=0; if not, when A=35,a=-7)
5a-20=
5a-20 = -15
5a- 2a = 3