Question

решите уровнение (х-80)*40=640

Answer 1

(х-80)*40=640
х-80=640:40
х-80=16
х=16+80
х=96

Answer 2

40x-80=640 40x-240=640
40x=640+80. 40x=640-240
40x=720. 40x=400
x=18. x=10