Simplify the left side by combining like terms and simplify the right side:
\(10x - 4y - 5x + 4y = 4\) which reduces to \(5x = 4\)
Solve for \(x\) by dividing both sides by 5:
\(x = \frac{4}{5}\)
Then substitute \(x = \frac{4}{5}\) back into either original equation to solve for \(y\).