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f(x)=5-3x f(t)+f(-2)=eval and simplify

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1 Answer

f(t) means to substitute t in for x in f(x).  f(-2) means to substitute -2 in for x in f(x)
 
f(t) = 5-3t
 
f(-2) = 5-3(-2) = 5+6 = 11
 
f(t) + f(-2) = (5-3t) + 11  = 5-3t+11 = 5+11-3t = 16 - 3t

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