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3X-2X=1-7
X=-6
x=8-3x
4x=8 /4
x=2
2x-4=4x-2
-4+2=4x-2x
-2=2x /-2
x=2
10x-20=4x-20
10x-4x=-20+20
6x=6 chyba źle przepisany
x=0
7-2x= 5x+28
-2x-5x=28-7
-7x=21 /-7
x=-3
8x-5=9x-5
8x-9x=-5+5
-x=0