6x-4x=7-3,adica 2x=4,de unde x=2
7x-2x=14-9,adica 5x=5,de unde x=1
8x-2x=19-13,adica 6x=6,de unde x=1
9x-5x=13-1,adica 4x=12,de unde x=3
10x-6x=28-4,adica 4x=24,de unde x=6
11x-9x=11-7,adica 2x=4,de unde x=2
13x-11x=20-8,adica 2x=22,de unde 4=11
15x-9x=11-17,adica 6x=-6,de unde x=-1
16x-13x=10-4,adica 3x=6,de unde x=2
18x-13x=28-8,adica 5x=20,de unde x=4
cu placereee
