x+2/5x=9/20
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![x+2/5x=9/20](/uploads/image/z/1271433-57-3.jpg?t=x%2B2%2F5x%3D9%2F20)
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x+2/5x=9/20
x+2/5x=9/20
x+2/5x=9/20
7/5x=9/20
x=9/20÷7/5
x=9/28
x+2/5x=9/20
45x=20x+40
25x=40
x=8/5
X=9/28,谢谢。
7/5x=9/20
x=9/20x5/7
x=9/28