andrew763
19.10.2019 •
Mathematics
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Ответ:
x + 20 - 1 = 28
Step-by-step explanation:
x = 9
substitute 9 for x into the equation
x + 20 - 1
9 + 20 - 1
29 - 1
28
substitute 9 for x into the equation
81 + 4
85