The functions \( f(x) = 2x + 3 \) and \( g(x) = \frac{x}{2} - 1 \) are given. If \( h(x) = f(g(x)) \), find the value of \( x \) for which \( h(x) = 7 \). Let's think step by step and output the final answer within \boxed{}.
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