Question

1 + 3x = x + 9
x = [?]

Answer 1

To solve the equation \( 1 + 3x = x + 9 \), we can follow these steps:

1. First, subtract \( x \) from both sides:
\[
1 + 3x - x = 9
\]
This simplifies to:
\[
1 + 2x = 9
\]

2. Next, subtract 1 from both sides:
\[
2x = 9 - 1
\]
This simplifies to:
\[
2x = 8
\]

3. Finally, divide both sides by 2:
\[
x = \frac{8}{2}
\]
This simplifies to:
\[
x = 4
\]

Thus, the solution is:
\[
x = 4
\]