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If \(f(x) = 2x + 3\), \(g(x) = 1 - 2x)\) and \(h(x) = 3x\). Prove that \(f \circ (g \circ h) = (f \circ g) \circ h\).
 
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This is a self-assessment task. Solve this question and assess the solution steps after the completion of the test on your own.