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2x-5x≤3+30
-3x≤33
x=≤33/3
x ≤11
c.s =[-∞,11]
-30 -3 ≤ 5x - 2x
-33 ≤ 3x
-33/3 ≤ x
-11 ≤ x
x ≥ -11
CS = [ -11 ; ∞ >