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a.
f(-2) = -2.(-2) + 3 = 4 + 3 = 7
f(3) = -2.3 + 3 = -6 + 3 = -3
b.
f(a) = -7
f(a) = -2a + 3
-7 = -2a + 3
-7 - 3 = -2a
-10 = -2a
5 = a