Question

18 9—x+—×（770-x）=770-5019 10

Answer 1

原式:18/19X + 9/10*770 - 9/10*X = 720

18/19X - 9/10*X =720 - 9/10*770

190*(18/19X -9/10*X) = 190*(720 - 9/10*770)

180X - 171X = 9X = 5130

X = 570