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How do you multiply and divide #\frac { 7x } { x ^ { 2} + 5x + 4} \cdot \frac { x ^ { 2} - 16} { x ^ { 2} + 2x } \div \frac { x - 4} { x + 1}#?
How do you simplify #log_3 ((4x)/(7y)^9)#?