5a+2-4a=0,a等于几?
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5a+2-4a=0,a等于几?5a+2-4a=0,a等于几?5a+2-4a=0,a等于几?5a+2-4a=05a-4a=-2a=-25a+2-4a=05a-4a=-2a=-25a-4a+2=05a-4
5a+2-4a=0,a等于几?
5a+2-4a=0,a等于几?
5a+2-4a=0,a等于几?
5a+2-4a=0
5a-4a=-2
a=-2
5a+2-4a=0
5a-4a=-2
a=-2
5a-4a+2=0
5a-4a=-2
a=-2
a+2=0
a=-2