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2 x (2a + 3b - 6)
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5ab-2ab+4a-b+5b = 3ab+4a+4b
4a + 3a = (4 + 3)a = 7a
3a * * * * * Actually, it is 4a.
58
9=4a+13 9-13=4a -4=4a -4/4=a -1=a a=-1