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2(a + 3) - 4 = 2(2a - 4) - 4
2a + 6 - 4 = 4a - 8 - 4
-2a = -12 - 2
-2a = -14
a = 7
f(a + 3) = f(2a - 4)
2(a+3) - 4 = 2(2a-4) - 4
2a + 6 - 4 = 4a - 8 - 4
2a + 2 = 4a - 12
2a = 14
a = 7