5a+2-4a=0,a等于几?

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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=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