* Remove the brackets and collect like teams:
a) 3x(x+4)-x(x+2)
b)7b(a+2)-a(3b+3)
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a) 3x² + 12x - x² - 2x
2x² + 10x
b) 7ab + 17b - 3ab - 3a
4ab - 3a + 17b
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