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Răspuns :

2x+5=x+6

2x-x=6-5

x=1

4x+9=3x+17

4x-3x=17-9

x=8

3-2x=-x+6

-2x+x=6-3

-x=3

x=-3

2x+12=x-6

2x-x=-6-12

x=-18

4-3x=x+12

-3x-x= 12-4

-4x=8

x=-2