If G(x)= \dfrac {3 x}{6 +2 x} , find G'(a) and use it to find
an equation of the tangent line to the curve
y=\dfrac {3 x}{6 +2 x} at the point (-8, {\frac{12}{5}}) .

G'(a) =

Tangent line:y=

Tangent line:

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