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5x - 7x - 7 + 11 = -2
-2x = -2 + 7 - 11
-2x = -6
x = 3
no 2. 3p - 3 + (-3p) + 8
3p - 3p - 3 + 8 = 5
no 3. 12kl -20 mn - 5kl -3mn
=12kl -5kl - 20m -3mn
=7kl -23mn
no 4. -4p2 +3pq - 2 - 6p2 + 8pq -3
-4p2 - 6p2 + 3pq + 8pq - 2 -3
-10p2 +11pq -5