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x=15+15
x=30
2x+6=9x
2x– 9x=–6
– 7x=– 6 /:– 7
x= 6/7
-2 (x – 1) + 4 ( 2+ x)=3 – 5x
– 2x+2 +8+4x=3– 5x
– 2x+4x+5x=– 2– 8+3
7x=7 /; 7
x=1
3x - (4 – x)=2 (x + 1) – 5
3x - 4+x=2x+2 - 5
3x+x - 2x= 4 +2 - 5
2x= 1 ;/2
x=1/2
3 ( 1 – x) – 5 = 8 – 2 ( x – 1)
3 - 3x -5= 8 - 2x + 2
- 3x+2x=8 - 3 + 5 + 2
- x=12 /: (- 1)
x =( - 12)
4x – 5 = 1 + 3x
4x-3x=1+5
x=6
-x + 3 = 2 ( x + 1) +1
-x+3=2x+2+1
-3x-2x= -3+2+1
-1 x=0 /: (-1)
x=0
wydaje mi sie że jest dobrze