\(x\times2+x\times3+x\times4+x=2\text{1}30\)
\(x\times2+x\times3+x\times4+x\times\text{1}=2\text{1}30\)
\(x=x\times\left(2+3+4+\text{1}\right)=2\text{1}30\)
\(x=x\times\text{1}0=2\text{1}30\)
\(x=2\text{1}30:\text{1}0\)
\(x=2\text{1}3\)
X x 2 + X x 3 +X x 4 + x =2130
X x ( 2 + 3 + 4 + 1 ) = 2130
X x 10 = 2130
X = 2130 : 10
X = 213
Vậy X =213
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