Answer:
(2*n)+9=n-30
Step-by-step explanation:
I'm not sure but I think that is the equation
Answer:
The number is 7.
Step-by-step explanation:
Write out the equation.
2x+9=30-x
Move the variable, x, so both variables are on one side of the equation.
2x+9=30-x
+x +x
Subtract 9 on both sides to combine like terms.
3x+9=30
-9 -9
Divide by 3 on both sides to isolate the variable.
3x=21
3x/3=21/3
x=7
