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10 = 20 - x
x=20-10 ; x=10
2. 1/5-x=x-1/6
5x-1/5= 6x-1/6
30x-6=30x-5
x=0
3) 12-4=x-2
8=x-2
8+2=x
x=10
4) 16-3=25-x
13=25-x
x=25-13
x=12