(2400-X)15=8000-X 快

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(2400-X)15=8000-X快(2400-X)15=8000-X快(2400-X)15=8000-X快(2400-X)15=8000-X2400×15-15X=8000-X14X=36000-8

(2400-X)15=8000-X 快
(2400-X)15=8000-X
快

(2400-X)15=8000-X 快
(2400-X)15=8000-X
2400×15-15X=8000-X
14X=36000-8000
14X=28000
X=2000