[a, b; c, d] * [-3; 2] + [e; f] = [1; 1]
[a, b; c, d] * [1; 1] + [e; f] = [-3; 2]
[a, b; c, d] * [-4; 2] + [e; f] = [-4; 2]
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-3·a + 2·b + e = 1
a + b + e = -3
-4·a + 2·b + e = -4 --> a = 5 ∧ b = 24 ∧ e = -32
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-3·c + 2·d + f = 1
c + d + f = 2
-4·c + 2·d + f = 2 --> c = -1 ∧ d = -5 ∧ f = 8
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M = [5, 24; -1, -5]
a = [-32; 8]