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Answer: 0
Step-by-step explanation:
[tex]7x + (-7) = 9x - 7[/tex]
[tex]7x - 7 = 9x - 7[/tex]
Now susbtract [tex]9x[/tex] from both sides
[tex]7x -7 - 9x = 9x - 7 - 9x\\-2x - 7 = -7[/tex]
Then add 7 to both sides
[tex]-2x - 7+7=-7+7\\2x=0[/tex]
[tex]x = \frac{0}{-2} \\x = 0[/tex]
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