Solve $3x + 4y = x - 8y + 24$ for $x$ in terms of $y$.
We want to get x alone on one side of the equation.
3x + 4y = x - 8y + 24 Subtract x from both sides.
2x + 4y = -8y + 24 Subtract 4y from both sides.
2x = -12y + 24 Divide through by 2 .
x = -6y + 12