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3. (3 - 17x + 35z) + (4x + 23y - 9 )
= 3 - 17x + 35z + 4x + 23y - 9
= -13x + 23y +35z - 6
5. (5x + 3) - (x - 1)
= 5x - x + 3 + 1
= 4x + 4
6. (2y + 15z) - (4y - 8)
= 2y - 4y + 15z + 8
= -2y + 15z + 8
9. a) Keliling bangun : 4.a
= 4.2a = 8a
b) Keliling bangun : 2.(p+l)
= 2.(3x+3y) = 6x + 6y
c) Keliling bangun : (b+a)+(b-d)+(a-c)+(d+a)
= 2a + 2b
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