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-9y = -66
y = 7 i jedna trzecia
b)-3(2x+1)+3x=-x
-6x - 3 + 3x = -x
-3x - 3 = -x / + 3x
-3 = 2x / : 2
-1,5 = x
c)-4a ≥ -5-2a / + 2a
- 2a ≥ -5 / - 2
a ≤ 2,5
d ) -(-6-k)-4k ≤ k
6 + k - 4k ≤ k
6 - 3k ≤ k / + 3k
6 ≤ 4k / : 4
1,5 ≤ k
e)-(-5)+x > -7
5 + x > -7 / -5
x > - 13