1) x + 5 = 9
4 + 5 = 9
There are many ways to figure out this equation. One way is to work backwards. 9 - 5 = 4 .
2) x - 2 = 9
11 - 2 = 9
To work backwards with this question, you go 9 + 2 = 11
3) 3x = 8.1
8.1 / 3 = 2.7
3(2.7) = 8.1
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