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= 7x + 11x + 8y - 3y
= 18x + 5y
2. 4ab - 2xy - 8ab + 6xy
= 4ab - 8ab + 6xy - 2xy
= - 4ab + 4xy
atau
4xy - 4ab
7x - 3y + 11x + 8y
=18x + 5y.
2.
4ab - 2xy - 8ab + 6xy
= -4ab +4xy