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In drilling world's deepest hole, it was...

In drilling world's deepest hole, it was found that the temperature T in degree celcius,x km below the surface of earth was given by `T = 30 + 25(x-3)` , `3 lt x lt 18`
If the temperature is between `300^@`C and `400^@`C, find an inequality in x.

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`300 lt 30 + 25 (x-3) lt 400`
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