\(x\times3,5-x\times2=30\)
\(x\times\left(3,5-2\right)=30\)
\(x\times1,5=30\)
\(x=30:1,5\)
\(x=20\)
\(3,5\times x-2\times x=30\\ \Leftrightarrow x\left(3,5-2\right)-30\\ \Leftrightarrow1,5x=30\\ \Leftrightarrow x=30:1,5\\ \Leftrightarrow x=20\)
Vậy \(x=20\)
X x 3,5 - X x 2 = 30
X x (3.5 - 2) = 30
X x 1.5 = 30
X = 30 : 1.5
X = 20