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y=2(x-1)
y=2x-2
y+2=2x /:2
x=(y+2):2
y=x-1:2 /*2
2y=x-1
x=(x-1):2
P=⅓(a²+2ax)
p : 0,5=a^2+2ax
x=((p:0,5)-a^2):2a
y=2:x-1 /*(x-1)
xy-y=2
x=(2+y):y
y+2=2x/ podzielone na 2
x=y+x/2
b.y=x-1/2 /+1/2
y+1/2=x
c.y=2/x-1 /*x
xy=2-1 /podzielone na y
x=1/y
d.p=1/3akwadrat+2/3ax /*3
3p=a kwadrat+2ax /-a kwadrat
3p- a kwadrat=2ax /podzielone na 2a
x=3p-a podzielone przez 2