Evaluate the surface integral F. ds for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = xi + yj + 7k, S is the boundary of the region enclosed by the cylinder x² + z² = 1 and the planes y = 0 and x + y = 3

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