Límite por la izquierda: en x

Límite por la derecha en x

a = 6.999999 (slider from 6.5 to 6.999999, step 1.0E-5)
b = 7.00000001 (slider from 7.00000001 to 7.5, step 1.0E-5)
f(x) = ((x^(2) - (7 * x) + 4) / (x - 3))^((x + 1) / (x - 7))
texto1: "x \to 7^{-} \implies f(" + (LaTeX[a]) + ")=\left(\dfrac{" + (LaTeX[a]) + "^2-7\cdot" + (LaTeX[a]) + "+4}{" + (LaTeX[a]) + "-3}\right)^{\frac{" + (LaTeX[a]) + "+1}{" + (LaTeX[a]) + "-7}}=" + (LaTeX[f(a)]) + ""
texto1_1: "x \to 7^{+} \implies f(" + (LaTeX[b]) + ")=\left(\dfrac{" + (LaTeX[b]) + "^2-7\cdot" + (LaTeX[b]) + "+4}{" + (LaTeX[b]) + "-3}\right)^{\frac{" + (LaTeX[b]) + "+1}{" + (LaTeX[b]) + "-7}}=" + (LaTeX[f(b)]) + ""