78.89—(38.89—0.4x)=50
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![78.89—(38.89—0.4x)=50](/uploads/image/z/94093-61-3.jpg?t=78.89%E2%80%94%EF%BC%8838.89%E2%80%940.4x%29%3D50)
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78.89—(38.89—0.4x)=50
78.89—(38.89—0.4x)=50
78.89—(38.89—0.4x)=50
78.89—(38.89—0.4x)=50
38.89-0.4x=28.89
0.4x=10
x=25