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4x-6+12-3x=-x-5
4x-3x+x=6-12-5
2x=-11 /:2
x=-5,5
b) 2x-6-12-4x=-3x-6+4x-2
2x-4x+3x-4x=6+12-6-2
-3x=10/ :(-3)
x=-10/3
c) 6x+6+6-3x=4x-2-4+x
6x-3x-4x-x=-6-6-2-4
-2x=-18/ :(-2)
x=9