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2014-05-12T19:07:05+03:00
14x +21 -20 +5x ≤12x +16 +4
19x +1 ≤12x +20
19x -12x ≤20-1
7x ≤19
x ≤19/7   ⇒x∈{ -19/7 ; 19/7}

1 5 1
2014-05-12T19:08:46+03:00
Mai intai inmultesti parantezele 
14x + 21 - 20 + 5x + 12 ≤ 12x + 16 + 4
acum scazi 12x
2x + 1 + 5x + 12 ≤ 20
7x + 13 ≤ 20
scazi 13
7x ≤ 7
imparti la 7
x ≤ 1 => x ∈ { 1 , 0 , - 1 , -2 ,  ... }