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3+5x
20-3x+y
2x+y+1
2x-2
-3y +3
3+6x-x
6x-x=3
5x=3 /:5
x=3/5
20+(-3x+y)
20-3x+y
17xy
2x-(-y-1)
2x+y-1
xy
(6x-4):2
3x-2
-3(y-1)
-3y+3