2x+28=4(100-x)解

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2x+28=4(100-x)解2x+28=4(100-x)解2x+28=4(100-x)解2x+28=400-4x6x=400-286x=372x=62解2x+28=4(100-x)2x+28=400

2x+28=4(100-x)解
2x+28=4(100-x)解

2x+28=4(100-x)解
2x+28=400-4x
6x=400-28
6x=372
x=62


2x+28=4(100-x)
2x+28=400-4x
2x+4x=400-28
6x=372
x=62