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Need help rearranging equation

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I''m stumped on this. I cant seem to properly rearrange this equation to solve for n. Can anyone help? Heres the equation: z + (na + .5n(n - 1)d) = c This equation uses five variables : z, a, b, c, n Any help is much appreciated.

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Looks to be a basic quadratic equation so put it into the format of
ax^2+bx+c = 0 and use the general equation for solving quadratics.


Just to start you off:

  
z + (na+0.5n(n-1)d) = c
na + 0.5dn^2 - 0.5nd + z-c = 0
0.5dn^2 + (a - 0.5d)n + z-c = 0
...


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