the value of (a+1)(a-1)(a+2) is( 3a-2)
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( a + 1 ) ( a - 1 ) ( a + 2 ) = ( 3a - 2 )
a + 1 + a - 1 a + 2 = 3a - 2
3a + 2 = 3a - 2
3a - 3a = -2 -2
a = -4
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