z + 8 - 2 is an expression, not an equation. An expression cannot be solved. At best, you can simplify it to z + 6.
Actually, 2x + 3y + z is an expression, because it is a mathematical noun.
The expression has no solution but it can be simplified to: z+6
(2z - 7)(z + 4)
Suppose the expression under the radical sign is y. Then the first step is to simplify y. Next find a term (or expression) x, such that y = x^2*z for some term (or expression) z. Then x*sqrt(z) is a simplification of sqrt(y).
Ten z plus one, or ten z plus ten. That depends on where you had parentheses in the original expression: (10 * z) +1 = 10z + 110 * (z + 1) = 10z + 10
359 more than z is z plus 359 which is: z + 359