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Use Euler's method with step size `0.2` to compute the approximate `y`-values `y(1.2)` and `y(1.4)`, of the solution of the initial-value problem
`y^(′) = 1 + 3 x + 4 y`,   `y(1)=2`.

`y(1.2)=`   ,

`y(1.4)=`   .