(2a-1)+(4-a)=0 a等于几,怎么算
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(2a-1)+(4-a)=0 a等于几,怎么算
(2a-1)+(4-a)=0 a等于几,怎么算
(2a-1)+(4-a)=0 a等于几,怎么算
(2a-1)+(4-a)=0
2a-1+4-a=0
2a-a=1-4
a=-3
2a-a+4-1=0
2a-1+4-a=0 a+3=0 a=-3