Variance of stochastic process

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I have stochastic process like: $Z(t) = X(t) - 0,5t$ where $X(t)$ is a Poisson process with intensity = 0,5.

I need to find a variance of stochastic proces $Z(t)$ when $t=2$. Any ideas?

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Hint $\operatorname{Var}(X(t) - 0.5 t) = \operatorname{Var}(X(t))$.