The value of x when r(x) = -4 is 20/3.
Given, the function is r(x) = ₋2/3x ₊ 4
substitute r(x) = ₋4 in the value of r(x)
r(₋4) = ₋2/3(₋4) ₊ 4
r(₋4) = 8/3 ₊ 4
r(₋4) = 8 ₊ 12/3
r(₋4) = 20/3
hence we get the value as 20/3
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