-3x-(-24)=-45
- 3x + 24 = -45
- 3x =-45-24
- 3x =-69
x= 69:3
x= 23
Vậy...
\(\frac{x}{7}\)= \(-\frac{6}{21}\)
=> 21 x = -6.7
21x = -42
x= -42:21
x= -2
Vậy...
\(\frac{x}{7}=-\frac{6}{21}\)
\(\Leftrightarrow x.21=7.\left(-6\right)\)
\(\Leftrightarrow x.21=-42\)
\(\Leftrightarrow x=-2\)
-3x-(-24)=-45
-3x+24=-45
-3=-45-24
-3x=-69
x=-69:(-3)
x=23
x/7=-6/21
x*3/7*3=-6/21
x*3/21=-6/21
x*3=-6
x=-6:3
x=-2
\(-3x-\left(-24\right)=-45\)
\(-3x+24=-45\)
\(-3x=-69\)
\(x=23\)
\(\frac{x}{7}=-\frac{6}{21}\)
\(\Leftrightarrow x.21=-6.7\)
\(\Leftrightarrow x.21=-42\)
\(\Leftrightarrow x=-2\)