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y=2x-2
2x=y+2
x=y+2/2
b)y=(x-1)/2
2y=x-1
x=2y+1
c) y=2/x-1
xy-y=2
xy=2+y
x=2+y/y
d)P=⅓(a²+2ax)
3P=a²+2ax
2ax=3P-a²
x=3P-a²/2a
/ to kreska ułamkowa