Write each of the following linear systems as a linear combination of the columns of the coefficient matrix:
(a) 3x1 + 2x2 + x3 = 4
x1 − x2 + 4x3 = −2
(b) −x1 + x2 = 3
2x1 − x2 = −2
3x1 + x2 = 1
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