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2. 5x +7x-6y-2y+8z+9z+7-10=12x-4y+27z-3
15a +7b -5c -11a -12b +13d
15a -11a +7b -12b -5c +13d
4a -5b -5c +13d
2. (5x -6y +8z) +(7x -9z) -(2y +9z -10)
5x -6y +8z +7x -9z -2y -9z +10
5x +7x -6y -2y +8z -9z -9z +10
12x -8y -10z +10