Given : -5 < x < 5
And we need to reach to a < 6x + 2 < b
So,
-5 < x < 5
multiply all sides by 6
-30 < 6x < 30
add 2 to all sides
-30 + 2 < 6x + 2 < 30 + 2
-28 < 6x + 2 < 32
Compare the final result to : a < 6x + 2 < b
So, a = -28 and b = 32
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