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3x=2t-y//:3
x=(2t-y)/3
b)y=2(x-1)//:
y/2=x-1
y/2+1=x
c)y=x-1 przez 2 (w ulamku)//*2
2y=x-1
2y+1=x
d)y=2 przez x-1 (w ulamku)//(x-1)
(x-1)y=2//:2
x-1=2/y
x=2/y +1
e) P= jedna trzecia (a do kwadratu+2ax) //*3
3P=a²+2ax
3P-a²=2ax//:2a
(3P-a²)/2a=x
x=(y+2)/2
x=2y+1
x=y/2+1
x=(3p-a)/2