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-x=4-5
-x=-1 /-1
x=1
spr. 5-1=4
x + 3 = 8
x=8-3
x=5
5+3=8
2x - 3 = 9
2x=9+3
2x=12 /2
x=6
spr. 12-3=9
3x + 4 = 13
3x=13-4
3x=9 /3
x=3
spr. 9+4=13
1-x = 0
x = 1
2. x+3=8
x=5
3. 2x-3=9
2x=12
1x=6
4. 3x + 4=13
3x=9
x=3
-x=4-5
-x=-1/:(-1)
x=1
x+3=8
x=8-3
x=5
2x-3=9
2x=9+3
2x=12/:2
x=6
3x+4=13
3x=13-4
3x=9/:3
x=3