If -2x>3y, is x negative?
(1) if y > 0 => -2x is +ve => x is -ve SUFF
(2) 2x = 20-5y
this => 2x+5y=20, from question take higher limit such that 2x =-3y => 2y = 20 => y > 0 and as in (1), x is -ve SUFF
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