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Which expressions are equivalent to -6 + 3m

Which is the graph of the piecewise function f(x)? f(x)=[tex]f(x) = \left \{ {{-x+1, x\leq 0 } \atop {x+1, x\ \textgreater \ 0}} \right.[/tex]

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5