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12x-8x=14-6
4x=8 /:4
x=2
-2x+9+5x=-18
-2x+5x=-18-9
3x=-27 /:3
x=9
-2x+3-x+4x=9
-2x-x+4x=9-3
x=6
3x-5+2x=10
3x+2x=10+5
5x=15 /:5
x=3