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= -6x+8y-12 + 14y-12x+20
= -6x - 12x + 8y +14y-12 +20
= -18x + 22y +8
2.(30a+14b-10c)-(-22a-24b+26d)
= 30a+14b-10c +22a+24b-26d
= 30a+22a+14b+24b-10c-26d
= 52a +38b-10c-26d