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20x-2-x-10=7x/-7x+10+2
12x=12/:12
x=1
2x-1/5-x-1=7/10x /razy 10
20x-2-x-1=7x
20x-x-7x=1+2
12x=3/: 12
x=0.25
:)
x - 0,7x = 1 i 1/5
0,3x = 1 i 1/5 /:0,3
x=4