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For f(x)= 7x+13, find f(x) when x= -3.
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For f(x)= 7x+13, find f(x) when x= -3.

User Norlan
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f(x) = 7x + 13
f(-3) = 7(-3) + 13
f(-3) = -21 + 13
f(-3) = -8
User Danilo Prado
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