find g(a-1) when g(x)=-1/2x+5
plug in a-1 where an x appears in the equation. then use algebra to simplify
g(a-1)=-1/2(a-1) + 5
g(a-1)= -1/2a +1/2 + 5
g(a-1) = -1/2a + 5.5
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