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Simplify each of the following expressions leaving your answer in index form.
(a) `3^3×3^4`
(b) `5^2×5^(-3)`
(c) `3^(3/2)×3^(-3/4)×3^(1/4)`
(d) `6^2×7^(-4)×(8^(-2))^2×6^3×7^2×8^4`