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To find the x value, 3x+2=0 ==> x=-2/3
f(-2/3)=12(-2/3)Cube-13(-2/3)Square-5(-2/3)+7
=12*-8/27-13*4/9+5*2/3+7
=-32/9-52/9+30/9+63/9
=1
The remainder is 1.
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