Given f(x)=7x+9\displaystyle {f{{\left({x}\right)}}}={7}{x}+{9}

a) Evaluate f(−2)\displaystyle {f{{\left(-{2}\right)}}}

f(−2)\displaystyle {f{{\left(-{2}\right)}}} =

b) Solve f(x)=23\displaystyle {f{{\left({x}\right)}}}={23}

x\displaystyle {x} =

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