Question

x*15-x-9-x=15

Answer 1

\(x\times15-x-9-x=15\)

\(\Rightarrow x\times15-\left(x+9+x\right)=15\)

\(\Rightarrow x\times15-\left(2x+9\right)=15\)

\(\Rightarrow x\times15=15+2x+9\)

\(\Rightarrow x\times15=24+2x\)

\(\Rightarrow x\times15-2x=24\)

\(\Rightarrow x\times\left(15-2\right)=24\)

\(\Rightarrow x\times13=24\)

\(\Rightarrow x=24:13\)

\(\Rightarrow x=\frac{24}{13}\)

Vậy \(x=\frac{24}{13}\)

Answer 2

\(x\cdot15-x-9-x=15\)

\(\Leftrightarrow15x-x-x=15+9\)

\(\Leftrightarrow13x=24\)

\(\Leftrightarrow x=\frac{24}{13}=1\frac{11}{13}\)

Vậy \(x=1\frac{11}{13}\)