Question

timx:

12-2:(x+3)=9

yx12-50=yx7

Answer 1

\(a,12-2:\left(x+3\right)=9\)

\(\Leftrightarrow2:\left(x+3\right)=3\)

\(\Leftrightarrow x+3=\frac{2}{3}\)

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

Answer 2

12-2:(x+3)=9

=> 12 - 2x - 6 = 9

=> -2x = 9+6-12 = 3

=> x= -1,5

12xy - 50 = 7xy

=> 12xy -7xy= 50

=> 5xy=50

=> xy = 10

=> x = 10/y

Answer 3

\(b,12y-50=7y\)

\(\Leftrightarrow12y-7y=50\)

\(\Leftrightarrow5y=50\)

\(\Leftrightarrow y=10\)

Answer 4

12-2:(x+3)=9                              yx17-50=yx12

2:(x+3)=12-9=3                          yx17-yx12=50  

x+3=2:3=2/3                              yx(17-12)=50

x=2/3-3=-7/3                              yx5=50

                                                y=50:5=10

    tk cho mih nhé