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Approximate the area under the graph of $f(x)=0.03x_{4}?1.21x_{2}+73$ over the interval $[3,7]$ by dividing the interval into 4 subintervals. Use the left endpoint of each subinterval. The area under the graph of $f(x)=0.03x_{4}?1.21x_{2}+73$ over the interval $[3,7]$ is approximately (Simplify your answer. Type an integer or a decimal.)