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12 + 8x - 6
8x + 6
b) 8(3x + 4y) - 5(4x - 6y)
24x + 32y - 20x + 30y
(24 - 20)x + (32 + 30)y
4x + 62y
c) 9x + 6y - 10y - 8x
(9 - 8)x + (6 - 10)y
x - 4y
= 12 + 2(4x) + 2(-3)
= 12 + 8x - 6
= 8x + 6
nomer2
= 8(3x + 4y) - 5(4x - 6y)
= 24x + 32y - 20x + 30y
= 24x -20x +32y +30y
= 4x +62y
nomer3
= 9x + 6y - 10y - 8x
= x - 4y