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解方程(7x+70)/(3x+70)=7/4
(7x+70)/(3x+70)=7/4
人气：498 ℃　时间：2020-01-28 01:21:34
解答
(7x+70)/(3x+70)=7/4
4*(7x+70)=(3x+70)*7
28x+280=21x+490
7x=210
x=30
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