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2014-11-08T10:18:30+02:00
243:(x-4)>9
x-4>9*243
x-4>2187
x>2187+4
x>2191

(2x+3x):5≤8
5x:5≤8
x≤8

[4*(13x+5x)]:36≤30
(4*18x)≤30*36
72x≤1080
x≤1080:72
x≤15

2 5 2