SOLVE 3x+3*(x+1)+3*(x+2)=999
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the answer is 110
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3x+3*(x+1)+3*(x+2)=999
3x+3×x+3×1+3×x+3×2=999
3x+3x+3+3x+6=999
9x+9=999
9x=999-9
9x=990
x=990/9
x=110
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