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Answer:
[tex](a + b - 3) + (b + 2a - 1) + (4 - 6b + 2a)[/tex]
=
[tex]a + 2a + 2a + b + b - 6b - 3 - 1 + 4[/tex]
[tex]5a - 4b - 4 + 4[/tex]
[tex] = 5a - 4b + 0[/tex]
[tex] = 5a - 4b[/tex]
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