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Consider a differential equation $\frac{d y(x)}{d x}-y(x)=x$ with the initial condition $y(0)=0$. Using Euler's first order method with a step size of $0.1$, the value of $y(0.3)$ is

1. $0.01$
2. $0.031$
3. $0.0631$
4. $0.3$