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f(3) = -2(3) + 3 = -6 + 3 = -3
f(a) = 7
-2a + 3 = 7
-2a = 7-3
-2a = 4
a = 4/-2
a = -2
f(-2) = -2.(-2)+3 = 4+3 = 7
f(x)= -2x+3
f(3)= -2.3+3 = -6+3 = -3