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= x - 3x + 2y - 4y + 8z - 10z
= - 2x - 2y - 2z
atau
-2(x + y + z)
2
4 + 2c + 8y - 6c + 3y - 10 + d
= 8y + 3y + 2c - 6cd + 4 - 10
= 11y - 4c + d - 6