z + 8 - 2 is an expression, not an equation. An expression cannot be solved. At best, you can simplify it to z + 6.
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The expression has no solution but it can be simplified to: z+6
3x + 2 = 82
z=.3
82 + 82 = 164
Expand z plus 11 times z plus 11 = (z+11)(z+11) = z2 + 22z + 121.