(45 • З) + 12,345 = 13,245
45 + 12,345 = 13,245
45Х = 13,245 - 12,345
45Х = 0,9
Х = 0,02
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(45 • З) + 12,345 = 13,245
45 + 12,345 = 13,245
45Х = 13,245 - 12,345
45Х = 0,9
Х = 0,02
45*x=900
x=900:45
x=20
Ответ:x=20