400 * (х - 5) = 10000
400 * х - 400 * 5 = 10000
400х - 2000 = 10000
400х = 10000 + 2000
400х = 12000
х = 12000 : 400
х = 30
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Verified answer
400 * (х - 5) = 10000
400 * х - 400 * 5 = 10000
400х - 2000 = 10000
400х = 10000 + 2000
400х = 12000
х = 12000 : 400
х = 30