Suppose f(x) is continuous and let ∫_0^7f(x)dx=7 and ∫_7^10f(x)dx=10 , find …

Suppose f(x)f(x) is continuous and let 07f(x)dx=7\displaystyle\int_0^7f\left(x\right)dx=7 and 710f(x)dx=10 \displaystyle\int_7^{10}f\left(x\right)dx=10 , find 502f(5x)dx\displaystyle5\int_0^2f\left(5x\right)dx.
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