b) \(x\left(2+3+4+1\right)=2130\)
\(10x=2130\)
\(x=213\)
\(x\times2+x\times3+x\times4+x=2130\)
\(x\times\left(2+3+4+1\right)=2130\)
\(x\times10=2130\)
\(x=213\)
\(=>x=\dfrac{2130}{2+3+4+1}=\dfrac{2130}{10}=213\)
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
⇔ 2x + 3x + 4x + x = 2130
⇔ 10x = 2130
⇔ x =213