2x-6+9-6x-12x+8=20-25x
2x-6x-12x+25x=20+6-9-8
9x=9x
x=1
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2x-6+9-6x-12x+8=20-25x
2x-6x-12x+25x=20+6-9-8
9x=9x
x=1