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2x= 6+3
2x=9
X=4,5
2. 3x-1=2
3x=2+1
3x=3
X=1
3. X+3=2x-1
X-2x=-3-1
-x=-4
X=4
4. 3x-2=x+1
3x-x=2+1
2x=3
X=1,5
5. X-6+3+2x=20
X+2x=6+20+3
3x=29