f(a) = -4
» 3a + 2 = -4
» 3a = -6
» a = -2
f(4) = b
» 3(4) + 2
» 12 + 2
» 14
→a+b = -2+14 = 12
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f(a) = -4
» 3a + 2 = -4
» 3a = -6
» a = -2
f(4) = b
» 3(4) + 2
» 12 + 2
» 14
→a+b = -2+14 = 12