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9z + 10 - 6z = 7 + 2z - 3
gather together z terms on the left
3z + 10 = 7 + 2z - 3
gather integers on the right
3z + 10 = 2z + 4
subtract 2z from each side
z + 10 = 4
subtract 10 from each side
z = - 6
----------------check in original equation
9(- 6) + 10 - 6(- 6) = 7 + 2(- 6) - 3
- 54 + 10 + 36 = 7 - 12 - 3
- 8 = - 8
--------------checks
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