Odpowiedź:
1. 2x + 1=11 / -1
2x= 10 / :2
x= 5
2. 23 -4x= 7 / +23
4x = 30 / :4
x= 7 i dwie czwarte .
3. 3x+7=2x+1 / -2x
3x + 7 -2x = 1
1x+7 =1 / -7
1x= -6 /:1
x= -6
4. 8x - 5 = 9x - 7 / -9x
8x-5 - 9x = -7
-1x -5 = -7 / +5
-1x = -2 /:1
x= 2
5. 6+4(3-k )= 3 (-2k +9)/+2k
6+ 4 (3-k) +2k= 3 + 9 / -6
4 (3-k) = 6/-4
3-k = 2 / +3
1k = 5 / : 1
x= 5
6. nodalej nie umim ;(
