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5a²b - ab² - 7a²b + 6ab²
-2a²b + 5ab²
2.
(2p - 3q)((5p + 2q)
10p² + 4pq - 15pq - 6q²
10p² - 11pq - 6q²
3. (p + 5) - (-3(2p + 1))
(p + 5) - (-6p - 3)
p + 5 + 6p + 3
7p + 8
4. p - 3 = 11
p = 11 + 3 = 14
5.
-(3x - 5) = - 4x - 2
-3x + 5 = -4x - 2
-3x + 4x = -2 - 5
x = -7