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= 2x + x + 5 - 3
= 3x + 2
b. a^2 + a + 6 + a^2 - 5a - 3
= a^2 + a^2 + a - 5a + 6 - 3
= 2a^2 - 4a + 3
= (2x + x)+(5-3)
=> x + 2
b. a² + a +6 + a² -5a -3
=(a²+a²)+(a-5a)+(6-3)
= 2a² -4a + 3