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b. 2x + 5 - x + 3 = x + 8
c. (x^2 + 4x - 1) - (2x^2 + 4x)
= x^2 + 4x - 1 - 2x^2 - 4x
= -x^2 - 1 (semua di kali negatif/min)
= x^2 + 1
d. (y^2 - 3) - (4y^2 +5y +6)
= y^2 - 3 - 4y^2 - 5y - 6
= -3y^2 - 5y - 9
e. 5a - 6 + ab - a - 2ab + 1
= 4a - ab - 5
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