a^2 + 4a + 4 = 3a^2 - 2a + 24a - 16
a^2 + 4a + 4 = 3a^2 + 22a - 16
2a^2 + 18a - 20 = 0 /:2
a^2 + 9a - 10 = 0
(a + 10)(a - 1) = 0
a1 = - 10
a2 = 1
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a^2 + 4a + 4 = 3a^2 - 2a + 24a - 16
a^2 + 4a + 4 = 3a^2 + 22a - 16
2a^2 + 18a - 20 = 0 /:2
a^2 + 9a - 10 = 0
(a + 10)(a - 1) = 0
a1 = - 10
a2 = 1