-12 >= 2x - 8
add eight to each side
-4 >= 2x
divide each side by two
-2 >= x
which can also be written as
x <= -2
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-2x + 6 <= 4x + 18 -2x <= 4x + 12 -12 <= 6x -2 <= x
When y is less than or equal to 2x-6
-2 - 2x is greater than or equal to 6 only if x is less than or equal to -4.
The two inequalities define a region of the coordinate plane: there is no unique solution.
It is an inequality in x.