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Use Euler's method with step size `0.5` to compute the approximate `y`-values `y(0.5)` and `y(1)`, of the solution of the initial-value problem
`y^(′) = 1 + 4 x -2 y`,   `y(0)=1`.

`y(0.5)=`   ,

`y(1)=`   .

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