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1/7 x 3x = 2187/7
1/7 x 3x = 729/7
35 x (1/7)x = 5/7
Differentiation lets you find the rate of change of a function. You can use this to find the maximum or minimum values of a differentiable function, which is useful in a lot of optimization problems. It's also necessary for differential equations, which are useful just about everywhere.
7 x (1/9)x = 7/59049 2x = 32