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MATLAB – Optimisation Linear Inequality Entry [on hold]

I am using fmincon in MATLAB for an optimisation problem.

Typically, the linear inequality constraints are specified with variables A and b as arguments ard MATLAB formulates the constraint as

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In my case, I want to formulate this

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How do I go about entering this into MATLAB?

My x is [6×1]
A is [6×6]
and b is [1×1]