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1: 2x=9-3
2x=6
x=6/2
x=3
2: 3x=10+5
3x=15
x=15/3
x=5
3: 7x-3x=18-2
4x=16
x=16/4
x=4
4: 10x-2x-5x=9-7-5
8x-5=16+5x
8x-5x=16+5
3x=21
x=7
5: x-4x=7+13
-3x=20
x=-20/3
6: 13+6x=23
6x=23+13
6x=10
x=5/3