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Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

For what value of x does 4x = (1/8) x + 5?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)