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-6y=12-3x/*(-1)
6y=12+3x/:6
y=2+1/3x
c) 4+2y=-6x
2y=-6x-4/:2
y=-3x-2
d) 3,9x-2,6+1,3y=0
1,3y=-3,9x+2,6/:1,3
y=-3x+2
e) 1/2x-1/4y+5/8=0
-1/4y=-1/2x-5/8/*(-1)
1/4y=1/2x+5/8/:1/4
y=2x+5/4
f) 3 1/3+6 2/3=-1 2/3y
-1 2/3y=3 1/3 + 6 2/3/*(-1)
1 2/3y = -3 1/3 - 6 2/3
5/3 y= -10/3 - 20/3 /: 5/3
y=-2 - 4
gdzieś zgubiłaś x w przykładzie f)