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-12+3+6 = 2n+n
-3 = 3n
n = 3/-3
n = -1
2.7-(-2)-(-2²)
= 8-(-4)
= 12
3.(-1²)+{2.(-3)}-{3.5}
= (-1)+(-6)-15
= -7-15
= -22
jadikan yg terkaik ya