Question

tìm x

x trừ 2/3 nhân (x + 9)=1

Answer 1

x-2/3*(x+9)=1

2/3*(x+9)=x-1

2/3x + 6=x-1

2/3x -x=-1-6

-1/3x=-7

x=21

Answer 2

\(x-\frac{2}{3}\times\left(x+9\right)=1\)

\(\frac{2}{3}\times\left(x+9\right)=x-1\)

\(\frac{2}{3}x+6=x-1\)

\(\frac{2}{3}x-x=-1-6\)

\(\frac{-1}{3}x=-7\)

\(x=-7:\frac{-1}{3}\)

\(x=21\)