X/3 + x/4 = 1/5 - 1/6

a)$\frac{\mathrm{x}}{3}+\frac{x}{4}=\frac{1}{5}-\frac{1}{6}$
b)$\frac{\mathrm{x}}{2}+\frac{x}{3}=\frac{1}{4}-\frac{x}{5}$
c)$(\mathrm{x}+1)^2-5=\mathrm{x}^2+11$​