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3ab - 2b + 3a - 5a + b
3ab + 3a - 5a - 2b + b
3ab - 2a - b
= 3 ab - 2b + 3a - 5a + b
= 3 ab - 2b + b + 3a - 5a
= 3 ab - b - 2a
semoga membantu :)
maaf kalau salah