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Question

Solve 2xx3+12x+3+3x+9(x3)(2x+3)=0, then x+1 is

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Solution

2x(x3)+1(2x+3)+3x+9(x3)(2x+3)=(x3)+2x(2x+3)+3x+9(x3)(2x+3)(x3)+2x(2x+3)+3x+9(x3)(2x+3)=0,4x2+10x+6=0,2x2+5x+3=0,(2x+3)(x+1)=0if(2x+3)=0,Theoriginalequationbecomesinvalid,I.e,(x+1)=0x=1

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