-3x+7=28
Move +7 to the other side. Sign changes from +7 to -7
-3x+7-7= 28-7
-3x= 21
Divide by -3
-3x/-3= 21/-3
x= -7
Answer: x=-7
For this case we have the following equation:
[tex]-3x + 7 = 28[/tex]
We must find the value of the variable "x":
Subtracting 7 from both sides of the equation:
[tex]-3x = 28-7[/tex]
Different signs are subtracted and the sign of the major is placed:
[tex]-3x = 21[/tex]
Dividing between -3 on both sides of the equation:
[tex]x = \frac {21} {- 3}\\x = -7[/tex]
Answer:
[tex]x = -7[/tex]
