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|2x+1| greater than or equal to |x-3|

you have to solve 4 problems:

(2x+1) >= (x-3)
(2x+1) >= -(x-3)
-(2x+1) >= (x-3)
-(2x+1) >= -(x-3)

some may have no solution, since it may not satisfy the initial condition.

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