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2x-6+12-3x=5
-x+6=5
-x=5-6
-x=-1 |:(-1)
x=1
2x-6+12-3x=5
2x-3x=5-6
-x=-1/*(-1)
x=1
2x-6+12-3x=5
2x-3x=5+6-12
-x=-1