Depends on what X is worth. If x was worth -10 then 5 plus - 10 = -5 so it would be lesson. But if X was worth -2, 5 plus -2 = 3.
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When y is less than or equal to 2x-6
x is greater than or equal to 6
-2 - 2x is greater than or equal to 6 only if x is less than or equal to -4.
2x2 + 2x - 8 = 2(x2 + x - 4). This can take any value greater than or equal to -8.5
They are all the points on or above the line [ y = -2x + 20 ]. There are a lot of them.