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A.
=> 3x + 4 + 5x - 2
= 8x + 2
B.
=> 2a² + 4 + 3a + 5a² + 2a - 1
= 7a² + 3 + 5a
C.
=> 3a² - 5ab - 2b² + 6ab + 7b² - a²
= 2a² + ab + 5b².
semoga bermanfaat yaa ....