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2. -2ab -(-3bc) +4ab -3bc -5ac
-2ab +3bc +4ab -3bc -5ac
-2ab +4ab +3bc -3bc -5ac
2ab -5ac
3. 3(x -2) +6(7x +1)
3x -6 +42x +6
3x +42x -6 +6
45x