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x + 9 = 13

3x = 12

x + 5 − 9 = 0

2x + 5 = 17

5x − 3 = 17

x − 3 = 1

7x = 35

[tex]\frac{4x}{4} =4[/tex]

3( x + 4) = 15

8 + x − 5 = 7