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x = 7,5
2. 3x = 13-2
x = 11/3
3. 4+ x =<12
x =< 12 -4
x=< 8
x = 15/2
3x+2 = 13
3x = 13 - 2
3x = 11
x = 11/3
4+x≤12
x ≤ 12 - 4
x ≤ 8