In all cases, you would substitute the number in parentheses for x and solve the equation. For example..
f(4) = 3/4 * 4 + 2
f(4) = 3 + 2
f(4) = 5
f(-4) = 3/4 * -4 + 2
f(-4) = -3 + 2
f(-4) = -1
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