How to solve a system of equations on mathematica?

 How to solve a system of equations on mathematica?

I need to solve the system of equations:
x” = a, x'(0) = v0, x(0) = x0
(where a, v0 and x0 are constants).
I’m trying to use the command Solve[{expr1,expr2,expr3},{var1,var2,var3}]
Presumably, the equation is x(t)= x0+v0t+1/2at^2, but the next part of the problem is to use the rules you obtained and replacement to construct a useable function x(t). So how can I solve the original system?

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