9X+(7/120-X)乘以28=1

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9X+(7/120-X)乘以28=19X+(7/120-X)乘以28=19X+(7/120-X)乘以28=19X+(7/120-X)乘以28=19x+7/120-x=1/288x=-19/840x=-

9X+(7/120-X)乘以28=1
9X+(7/120-X)乘以28=1

9X+(7/120-X)乘以28=1

9X+(7/120-X)乘以28=1
9x+7/120-x=1/288x=-19/840x=-19/6720保正确,望采纳,谢谢