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7x+7=35
1,1x+1=x-2
2(x-9)=2x+1


Răspuns :

7x+7=35
7x=35-7
7x=28
x=4

1,1x+1=x-2
1,1x-x=-2-1
0,1x=-3
x=-30

2x-18=2x+1
2x-2x=1+18
0=19