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a. f(2) = 10 - 3(2) = 10 - 6 = 4
f(-2) = 10 - 3(-2) = 10 - (-6) = 10 +6 = 16
b. f(x)= -5
10 - 3x = -5
3x = 10+5
3x = 15
x=5