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f(0) = 0 + b = 3
b = 3
f(2) = 2a + b = 7
2a + 3 = 7
2a = 7 - 3 = 4
a = 2
f(x) = 2x + 3
f(-2) = 2.(-2) + 3
= -4 + 3 = -1