Given the function
f(x)={6x+6x<06x+12x0\displaystyle {f{{\left({x}\right)}}}={\left\lbrace\begin{array}{cc} {6}{x}+{6}&{x}<{0}\\{6}{x}+{12}&{x}\geq{0}\end{array}\right.}

Calculate the following values:
f(1)=\displaystyle {f{{\left(-{1}\right)}}}=
f(0)=\displaystyle {f{{\left({0}\right)}}}=
f(2)=\displaystyle {f{{\left({2}\right)}}}=