Respuesta :
9-4x+7x=15
9+3x=15
move 9 to the other side
sign changes from +9 to -9
9-9+3x=15-9
3x=6
Divide by 3 for both sides
3x/3=6/3
Cross out 3 and 3, divide by 3 and then becomes 1*1*x=x
x=2
Answer: x=2
For this case we must solve the following equation:
[tex]9-4x + 7x = 15[/tex]
We add similar terms from the left side of the equation:
[tex]9 + 3x = 15[/tex]
We subtract 9 from both sides of the equation:
[tex]3x = 15-9\\3x = 6[/tex]
Dividing by 3 on both sides of the equation:
[tex]x = \frac {6} {3}\\x = 2[/tex]
Answer:
[tex]x = 2[/tex]