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x/12=1-y/8 /*12
x=12-12y/8 mamy x
x/12+y/8 =1 /-x/12
y/8=1-x/12 /*8
y=8-8x/12 mamy y
x-2/4 - y-6/2=3 /+y
x-0,5-3=3+y
x-3,5=3+y /+3,5
x=6,5+y
x-2/4 - y-6/2=3 /-x
-2/4-y-3=3-x /+2/4
-y-3=3-x+0,5 /+3
-y=3-x+0,5+3 /*(-1)
y=-3+x-0,5-3
y=-6,5+x
x+6y-1=0 /+6y
x-1=6y /+1
x=6y+1
x+6y-1=0 /-x
6y+1=-x /-1
6y=-x-1 //6
y=x/6-1/6
(4-x)(4+x)+y=2-(1-x)²