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Sagot :
Let the variable n represent the unknown number
- Start with n
[tex] \tt \longrightarrow \: n[/tex]
- Increased by 13 means add 13 to it
[tex] \tt \longrightarrow \: n + 13[/tex]
- Is 1989 means it equals 1989
[tex] \tt \longrightarrow \: n + 13 = 1989[/tex]
➪ Thus, The final equation is (n+13=1989)
Answer:
expression: x + 13 = 1989
explanation:
Let the number be x
so when this number is increased " + " by 13, it equals to 1989
processing:
- x + 13 = 1989
- x = 1989 - 13
- x = 1976
The number is 1976.
The algebraic equation used: x + 13 = 1989
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